Update travis.yml (#1010)

* Use xenial dist

* Only install coveralls after success

* Latest version of pypi

* Refactor travis.yml into stages and add travis-tox

* Drop 2.6

* Bump to python 3.7

.travis.yml

@@ -1,30 +1,39 @@
 language: python
-matrix:
-  include:
-    - env: TOXENV=py27
-      python: 2.7
-    - env: TOXENV=py35
-      python: 3.5
-    - env: TOXENV=py36
-      python: 3.6
-    - env: TOXENV=py37
-      python: 3.7
 dist: xenial
-      sudo: true
-    - env: TOXENV=pypy
-      python: pypy-5.7.1
-    - env: TOXENV=pre-commit
-      python: 3.6
-    - env: TOXENV=mypy
-      python: 3.6
+
+python:
+  - "2.7"
+  - "3.5"
+  - "3.6"
+  - "3.7"
+  - "pypy3"
+
 install:
-  - pip install coveralls tox
+  - pip install tox tox-travis
 script: tox
-after_success: coveralls
+after_success:
+  - pip install coveralls
+  - coveralls
 cache:
   directories:
     - $HOME/.cache/pip
     - $HOME/.cache/pre-commit
+
+stages:
+  - test
+  - name: deploy
+    if: tag IS present
+
+jobs:
+  fast_finish: true
+  include:
+    - env: TOXENV=pre-commit
+      python: 3.7
+    - env: TOXENV=mypy
+      python: 3.7
+    - stage: deploy
+      python: 3.7
+      after_success: true
       deploy:
         provider: pypi
         user: syrusakbary

tox.ini

@@ -14,7 +14,7 @@ commands =
     py{36,37}: py.test --cov=graphene graphene examples tests_asyncio tests_py36 {posargs}
 
 [testenv:pre-commit]
-basepython=python3.6
+basepython=python3.7
 deps =
     pre-commit>0.12.0
 setenv =
@@ -23,7 +23,7 @@ commands =
     pre-commit {posargs:run --all-files}
 
 [testenv:mypy]
-basepython=python3.6
+basepython=python3.7
 deps =
     mypy
 commands =