chore(package): update tsickle to version 0.38.1

Closes #31

Author: greenkeeper[bot]

package.json

@@ -107,7 +107,7 @@
     "source-map-loader": "^0.2.4",
     "to-string-loader": "^1.1.5",
     "travis-status": "^3.0.1",
-    "tsickle": "~0.34.3",
+    "tsickle": "~0.38.1",
     "tslint": "~5.15.0",
     "typescript": "~3.2.4",
     "webpack": "^4.33.0",