.travis.yml in graphql-batch-0.4.2 vs .travis.yml in graphql-batch-0.4.3

- old
+ new

@@ -1,7 +1,11 @@
 language: ruby
 rvm:
   - 2.3
-  - 2.6
+  - 2.7
 env:
-  - TESTING_INTERPRETER=true
-  - TESTING_INTERPRETER=false
+  -
+    GRAPHQL_VERSION: 1.9.19
+    TESTING_LEGACY_DEFINITION_LAYER: true
+  -
+    GRAPHQL_VERSION: 1.10.2
+    TESTING_LEGACY_DEFINITION_LAYER: false