Support Python 3.6

Currently Python latest version is 3.6.1, so we should support this version.
Fortunately there is no problem to run all tests on python 3.6 😎

Author: Tasuku OKUDA

README.rst

@@ -623,6 +623,7 @@ Test by using tox. We test against the following versions.
 -  3.3
 -  3.4
 -  3.5
+-  3.6
 
 To run all tests and to run ``flake8`` against all versions, use:
 

setup.py

@@ -83,6 +83,7 @@ def run_tests(self):
         "Programming Language :: Python :: 3.3",
         "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
         "Topic :: Software Development"
     ]
 )

tox.ini

@@ -1,27 +1,27 @@
 [tox]
-envlist = py27, py33, py34, py35, py35-flake8-src, py35-flake8-tests
+envlist = py27, py33, py34, py35, py36, py36-flake8-src, py36-flake8-tests, py36-flake8-other
 
 [testenv]
 deps =
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/requirements-test.txt
 commands = py.test -v tests/
 
-[testenv:py35]
-basepython = python3.5
+[testenv:py36]
+basepython = python3.6
 deps = {[testenv]deps}
 commands = py.test -v --cov=linebot tests/
 
-[testenv:py35-flake8-src]
-basepython = python3.5
+[testenv:py36-flake8-src]
+basepython = python3.6
 deps =
     flake8
     flake8-docstrings
     pydocstyle==1.1.1
 commands = flake8 linebot/
 
-[testenv:py35-flake8-other]
-basepython = python3.5
+[testenv:py36-flake8-other]
+basepython = python3.6
 deps =
     flake8
 commands = flake8 tests/ examples/