chore(package): update ts-jest to version 23.0.1

Closes #58

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
     "raf": "^3.4.0",
     "react-dom": "^16.2.0",
     "rimraf": "^2.6.2",
-    "ts-jest": "^22.0.0",
+    "ts-jest": "^23.0.1",
     "ts-loader": "^3.1.1",
     "tslint": "^5.8.0",
     "typescript": "^2.6.1",