flake8: Fix all Wxxx whitespace and newline warnings

hbmqtt/plugins/__init__.py

@@ -1,4 +1,3 @@
 # Copyright (c) 2015 Nicolas JOUANIN
 #
 # See the file license.txt for copying permission.
-

tox.ini

@@ -11,9 +11,6 @@ ignore =
     F403,  # 'from x import *' used; unable to detect undefined names (~29 warnings)
     F821,  # undefined name 'x' (~1 warnings)
     F841,  # local variable 'wildcard_pattern' is assigned to but never used (~17 warnings)
-    W291,  # trailing whitespace (~1 warnings)
-    W292,  # no newline at end of file (~18 warnings)
-    W391,  # blank line at end of file (~1 warnings)
     E265,  # block comment should start with '# ' (~64 warnings)
     E501,  # line too long  (~664 warnings)
     F405,  # 'x' may be undefined, or defined from star imports (~401 warnings)