ci/Makefile: add checkqa target to run flake8

Author: blueyed

.travis.yml

@@ -19,7 +19,7 @@ matrix:
       - TEST_PROFILE=vim-profile-master.txt
     - env:
       - VIM_VERSION=installed
-      - MAKE_TARGET="clean_compiled check js/test py/test test/node_position/test_position.out"
+      - MAKE_TARGET="clean_compiled check checkqa js/test py/test test/node_position/test_position.out"
       - TEST_PROFILE=vim-profile-installed.txt
 
 install:

Makefile

@@ -16,6 +16,9 @@ check: all
 	  echo 'Compiled files were updated, but should have been included/committed.'; \
 	  exit 1; }
 
+checkqa: all
+	flake8 py
+
 test:
 	test/run.sh