Support Python 3.4

Add python 3.4 for CI

Author: pquentin

.appveyor.yml

@@ -6,6 +6,8 @@ environment:
   matrix:
     - PYTHON: "C:\\Python27"
     - PYTHON: "C:\\Python27-x64"
+    - PYTHON: "C:\\Python34"
+    - PYTHON: "C:\\Python34-x64"
     - PYTHON: "C:\\Python35"
     - PYTHON: "C:\\Python35-x64"
     - PYTHON: "C:\\Python36"

.travis.yml

@@ -11,6 +11,7 @@ matrix:
     - python: pypy2.7-7.1.1
     - python: 2.7
     - python: pypy3.5
+    - python: 3.4
     - python: 3.5
     - python: 3.6
     - python: 3.7

pytest.ini

@@ -0,0 +1,7 @@
+[pytest]
+norecursedirs = .git .* *.egg* old docs dist build
+addopts = -rw
+filterwarnings =
+    error
+    # python3.4 raises this when importing setuptools
+    ignore:The value of convert_charrefs will become True in 3.5.*:DeprecationWarning

setup.py

@@ -21,15 +21,22 @@
     package_dir={"": "src"},
     install_requires=[],
     keywords=["async"],
-    python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4",
+    python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, <4",
     classifiers=[
         "License :: OSI Approved :: MIT License",
         "License :: OSI Approved :: Apache Software License",
         "Framework :: Trio",
         "Operating System :: POSIX :: Linux",
         "Operating System :: MacOS :: MacOS X",
         "Operating System :: Microsoft :: Windows",
-        "Programming Language :: Python :: 3 :: Only",
+        'Programming Language :: Python :: 2',
+        'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
+        'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
     ],