Update CONTRIBUTING.md [ci skip]

CONTRIBUTING.md

@@ -3,7 +3,9 @@
 # Contribute to spaCy
 
 Thanks for your interest in contributing to spaCy 🎉 The project is maintained
-by [@honnibal](https://github.com/honnibal) and [@ines](https://github.com/ines),
+by **[@honnibal](https://github.com/honnibal)**,
+**[@ines](https://github.com/ines)**, **[@svlandeg](https://github.com/svlandeg)** and
+**[@adrianeboyd](https://github.com/adrianeboyd)**,
 and we'll do our best to help you get started. This page will give you a quick
 overview of how things are organized and most importantly, how to get involved.
 
@@ -50,8 +52,7 @@ issue body. A few more tips:
   parts and don't just dump your entire script. This will make it easier for us to
   reproduce the error.
 
-- **Getting info about your spaCy installation and environment:** If you're
-  using spaCy v1.7+, you can use the command line interface to print details and
+- **Getting info about your spaCy installation and environment:** You can use the command line interface to print details and
   even format them as Markdown to copy-paste into GitHub issues:
   `python -m spacy info --markdown`.
 
@@ -60,7 +61,7 @@ issue body. A few more tips:
   model is incompatible with your spaCy installation. In spaCy v2.0+, you can check
   this on the command line by running `python -m spacy validate`.
 
-- **Sharing a model's output, like dependencies and entities:** spaCy v2.0+
+- **Sharing a model's output, like dependencies and entities:** spaCy
   comes with [built-in visualizers](https://spacy.io/usage/visualizers) that
   you can run from within your script or a Jupyter notebook. For some issues, it's
   helpful to **include a screenshot** of the visualization. You can simply drag and
@@ -99,7 +100,7 @@ questions:
   changes to spaCy's built-in methods. In contrast, a library of word
   alignment functions could easily live as a separate package that depended on
   spaCy — there's little difference between writing `import word_aligner` and
-  `import spacy.word_aligner`. spaCy v2.0+ makes it easy to implement
+  `import spacy.word_aligner`. spaCy makes it easy to implement
   [custom pipeline components](https://spacy.io/usage/processing-pipelines#custom-components),
   and add your own attributes, properties and methods to the `Doc`, `Token` and
   `Span`. If you're looking to implement a new spaCy feature, starting with a
@@ -109,8 +110,8 @@ questions:
   library later.
 
 - **Would the feature be easier to implement if it relied on "heavy" dependencies spaCy doesn't currently require?**
-  Python has a very rich ecosystem. Libraries like scikit-learn, SciPy, Gensim or
-  TensorFlow/Keras do lots of useful things — but we don't want to have them as
+  Python has a very rich ecosystem. Libraries like PyTorch, TensorFlow, scikit-learn, SciPy or Gensim
+  do lots of useful things — but we don't want to have them as default
   dependencies. If the feature requires functionality in one of these libraries,
   it's probably better to break it out into a different package.
 
@@ -137,19 +138,7 @@ files, a compiler, [pip](https://pip.pypa.io/en/latest/installing/),
 [virtualenv](https://virtualenv.pypa.io/en/stable/) and
 [git](https://git-scm.com) installed. The compiler is usually the trickiest part.
 
-```
-python -m pip install -U pip
-git clone https://github.com/explosion/spaCy
-cd spaCy
-
-python -m venv .env
-source .env/bin/activate
-export PYTHONPATH=`pwd`
-pip install -r requirements.txt
-python setup.py build_ext --inplace
-```
-
-If you've made changes to `.pyx` files, you need to recompile spaCy before you
+If you've made changes to `.pyx` files, you need to **recompile spaCy** before you
 can test your changes by re-running `python setup.py build_ext --inplace`.
 Changes to `.py` files will be effective immediately.
 
@@ -184,7 +173,7 @@ sure your test passes and reference the issue in your commit message.
 ## Code conventions
 
 Code should loosely follow [pep8](https://www.python.org/dev/peps/pep-0008/).
-As of `v2.1.0`, spaCy uses [`black`](https://github.com/ambv/black) for code
+spaCy uses [`black`](https://github.com/ambv/black) for code
 formatting and [`flake8`](http://flake8.pycqa.org/en/latest/) for linting its
 Python modules. If you've built spaCy from source, you'll already have both
 tools installed.
@@ -216,8 +205,7 @@ list of available editor integrations.
 #### Disabling formatting
 
 There are a few cases where auto-formatting doesn't improve readability – for
-example, in some of the language data files like the `tag_map.py`, or in
-the tests that construct `Doc` objects from lists of words and other labels.
+example, in some of the language data files or in the tests that construct `Doc` objects from lists of words and other labels.
 Wrapping a block in `# fmt: off` and `# fmt: on` lets you disable formatting
 for that particular code. Here's an example:
 
@@ -281,6 +269,9 @@ except:  # noqa: E722
 ### Python conventions
 
 All Python code must be written **compatible with Python 3.6+**.
+
+#### I/O and handling paths
+
 Code that interacts with the file-system should accept objects that follow the
 `pathlib.Path` API, without assuming that the object inherits from `pathlib.Path`.
 If the function is user-facing and takes a path as an argument, it should check
@@ -290,14 +281,18 @@ accept **file-like objects**, as it makes the library IO-agnostic. Working on
 buffers makes the code more general, easier to test, and compatible with Python
 3's asynchronous IO.
 
+#### Composition vs. inheritance
+
 Although spaCy uses a lot of classes, **inheritance is viewed with some suspicion**
 — it's seen as a mechanism of last resort. You should discuss plans to extend
 the class hierarchy before implementing.
 
+#### Naming conventions
+
 We have a number of conventions around variable naming that are still being
 documented, and aren't 100% strict. A general policy is that instances of the
-class `Doc` should by default be called `doc`, `Token` `token`, `Lexeme` `lex`,
-`Vocab` `vocab` and `Language` `nlp`. You should avoid naming variables that are
+class `Doc` should by default be called `doc`, `Token` → `token`, `Lexeme` → `lex`,
+`Vocab` → `vocab` and `Language` → `nlp`. You should avoid naming variables that are
 of other types these names. For instance, don't name a text string `doc` — you
 should usually call this `text`. Two general code style preferences further help
 with naming. First, **lean away from introducing temporary variables**, as these