Update CI's crystal version

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Install Crystal
         uses: oprypin/install-crystal@v1.2.4
         with:
-          crystal: 0.36.1
+          crystal: 1.0.0
       
       - name: Cache Shards
         uses: actions/cache@v2