.travis.yml in graphql-guard-1.1.0 vs .travis.yml in graphql-guard-1.2.0

@@ -3,5 +3,11 @@
 rvm:
   - 2.3.4
 env:
   - CI=true
 before_install: gem install bundler -v 1.15.2
+matrix:
+  include:
+    - gemfile: graphql-1.7.gemfile
+      env: GRAPHQL_RUBY_VERSION=1_7
+    - gemfile: graphql-1.8.gemfile
+      env: GRAPHQL_RUBY_VERSION=1_8