Fix errors in travis config
diff --git a/.travis.yml b/.travis.yml
index 261c479..f7e610c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,6 +14,5 @@
     include:
         env: LINT_CHECK
         python: "2.7"
-        addons: true
         install: pip install flake8
         script: flake8