Support graphql-subscriptions v2

Author: anajavi

package-lock.json

@@ -39,7 +39,7 @@
     "iterall": "^1.3.0"
   },
   "peerDependencies": {
-    "graphql-subscriptions": "^1.0.0"
+    "graphql-subscriptions": "^1.0.0 || ^2.0.0"
   },
   "devDependencies": {
     "@istanbuljs/nyc-config-typescript": "^1.0.1",
@@ -54,8 +54,8 @@
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
     "eslint": "^7.7.0",
-    "graphql": "^15.3.0",
-    "graphql-subscriptions": "^1.1.0",
+    "graphql": "^15.7.2",
+    "graphql-subscriptions": "^2.0.0",
     "ioredis": "^4.17.3",
     "mocha": "^8.1.3",
     "nyc": "^15.1.0",