Update pip references with pip3 (#527)

README.rst

@@ -22,7 +22,7 @@ Installing
 
 .. code:: sh
 
-  pip install telethon
+  pip3 install telethon
 
 
 Creating a client

readthedocs/extra/basic/getting-started.rst

@@ -11,7 +11,7 @@ Getting Started
 Simple Installation
 *******************
 
-   ``pip install telethon``
+   ``pip3 install telethon``
 
    **More details**: :ref:`installation`
 

readthedocs/extra/basic/installation.rst

@@ -10,21 +10,20 @@ Automatic Installation
 
 To install Telethon, simply do:
 
-    ``pip install telethon``
+    ``pip3 install telethon``
 
-If you get something like ``"SyntaxError: invalid syntax"`` or any other
-error while installing/importing the library, it's probably because ``pip``
-defaults to Python 2, which is not supported. Use ``pip3`` instead.
+Needless to say, you must have Python 3 and PyPi installed in your system.
+See https://python.org and https://pypi.python.org/pypi/pip for more.
 
 If you already have the library installed, upgrade with:
 
-    ``pip install --upgrade telethon``
+    ``pip3 install --upgrade telethon``
 
 You can also install the library directly from GitHub or a fork:
 
    .. code-block:: sh
 
-        # pip install git+https://github.com/LonamiWebs/Telethon.git
+        # pip3 install git+https://github.com/LonamiWebs/Telethon.git
         or
         $ git clone https://github.com/LonamiWebs/Telethon.git
         $ cd Telethon/
@@ -39,7 +38,7 @@ Manual Installation
 1. Install the required ``pyaes`` (`GitHub`__ | `PyPi`__) and
    ``rsa`` (`GitHub`__ | `PyPi`__) modules:
 
-    ``sudo -H pip install pyaes rsa``
+    ``sudo -H pip3 install pyaes rsa``
 
 2. Clone Telethon's GitHub repository:
    ``git clone https://github.com/LonamiWebs/Telethon.git``