.travis.yml in graphql-guard-0.3.0 vs .travis.yml in graphql-guard-0.4.0

@@ -1,5 +1,7 @@
 sudo: false
 language: ruby
 rvm:
   - 2.3.4
+env:
+  - CI=true
 before_install: gem install bundler -v 1.15.2