.travis.yml in rspec-graphql_matchers-1.0.1 vs .travis.yml in rspec-graphql_matchers-1.1

- old
+ new

@@ -2,5 +2,11 @@
 language: ruby
 rvm:
   - 2.3.1
 before_install: gem install bundler -v 1.12.3
 script: bundle exec rspec
+matrix:
+  include:
+    - name: "GraphQL 1.9.x"
+      env: GRAPHQL_GEM_VERSION=1.9
+    - name: "GraphQL 1.8.x"
+      env: GRAPHQL_GEM_VERSION=1.8