Run tests on both crystal 0.30.1 and 0.31.1

Author: hanneskaeufler

.circleci/config.yml

@@ -6,7 +6,15 @@ jobs:
       - image: crystallang/crystal:0.31.1
     steps:
       - checkout
-  test:
+  test-crystal-0.30.1:
+    <<: *test-template
+    docker:
+      - image: crystallang/crystal:0.30.1
+    steps:
+      - checkout
+      - run: shards
+      - run: SPEC_VERBOSE=1 ./bin/test
+  test-crystal-0.31.1:
     <<: *test-template
     steps:
       - checkout
@@ -29,7 +37,8 @@ workflows:
   version: 2
   ci:
     jobs:
-      - test
+      - test-crystal-0.31.1
+      - test-crystal-0.30.1
   nightly:
     triggers:
       - schedule:
@@ -38,5 +47,6 @@ workflows:
             branches:
               only: master
     jobs:
-      - test
+      - test-crystal-0.31.1
+      - test-crystal-0.30.1
       - test-mutations