Drop Python 2.7 from tests and doc

.travis.yml

@@ -1,6 +1,5 @@
 language: python
 python:
-  - '2.7'
   - '3.5'
   - '3.6'
   - '3.7'

doc/manual_installation/webserver.rst

@@ -50,7 +50,7 @@ This is just one possible configuration.
 To use mod_wsgi daemon mode, add the two following directives just
 under ``WSGIScriptAlias``::
 
-  WSGIDaemonProcess example.com python-path=<modoboa_instance>:<virtualenv path>/lib/python2.7/site-packages
+  WSGIDaemonProcess example.com python-path=<modoboa_instance>:<virtualenv path>/lib/python3.7/site-packages
   WSGIProcessGroup example.com
 
 Replace values between ``<>`` with yours. If you don't use a

setup.py

@@ -60,12 +60,10 @@ if __name__ == "__main__":
             "Intended Audience :: System Administrators",
             "License :: OSI Approved :: ISC License (ISCL)",
             "Operating System :: OS Independent",
-            "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",
             "Topic :: Communications :: Email",
             "Topic :: Internet :: WWW/HTTP",
         ],

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{27,35,36,37}
+envlist = py{35,36,37}
 
 [testenv]
 changedir = test_project