drop support for 3.4 and 3.5

.github/workflows/python-package.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.4, 3.5, 3.6]
+        python-version: [3.6, 3.7]
 
     steps:
     - uses: actions/checkout@v2

setup.cfg

@@ -1,2 +1,2 @@
 [bdist_wheel]
-python-tag = py34.py35
+python-tag = py36.py37

setup.py

@@ -8,7 +8,7 @@ from hbmqtt.version import get_version
 setup(
     name="hbmqtt",
     version=get_version(),
-    description="MQTT client/broker using Python 3.4 asyncio library",
+    description="MQTT client/broker using Python asyncio",
     author="Nicolas Jouanin",
     author_email='nico@beerfactory.org',
     url="https://github.com/beerfactory/hbmqtt",
@@ -30,9 +30,8 @@ setup(
         'Operating System :: POSIX',
         'Operating System :: MacOS',
         'Operating System :: Microsoft :: Windows',
-        'Programming Language :: Python :: 3.4',
-        'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
         'Topic :: Communications',
         'Topic :: Internet'
     ],

tox.ini

@@ -5,8 +5,6 @@ ignore =
 
 [tox]
 envlist =
-    py34,
-    py35,
     py36,
     py37,
     coverage,