chore(deps): pin typescript to ~3.5.2

Author: imhoffd

package.json

@@ -62,6 +62,6 @@
     "ts-jest": "^23.10.5",
     "tslint": "^5.12.1",
     "tslint-ionic-rules": "0.0.21",
-    "typescript": "^3.2.2"
+    "typescript": "~3.5.2"
   }
 }