Update dependency ts-jest to v22.4.6

Author: renovate-bot

package.json

@@ -70,7 +70,7 @@
     "node-dev": "3.1.3",
     "pretty-format": "22.4.0",
     "release-it": "7.2.1",
-    "ts-jest": "22.4.1",
+    "ts-jest": "22.4.6",
     "tslint": "5.9.1",
     "typescript": "2.7.2"
   },