Update dependency ts-jest to v22.4.0

Author: renovate-bot

package.json

@@ -45,7 +45,7 @@
     "opencollective": "1.0.3",
     "prettier": "1.11.1",
     "rimraf": "2.6.2",
-    "ts-jest": "21.2.4",
+    "ts-jest": "22.4.0",
     "tslint": "5.9.1",
     "typescript": "2.7.2"
   },