Update typescript version (#44)

Author: bwoskow-ld

package.json

@@ -57,7 +57,7 @@
     "tslint": "^5.19.0",
     "tslint-config-prettier": "^1.18.0",
     "tslint-plugin-prettier": "^2.0.1",
-    "typescript": "~3.8.3"
+    "typescript": "^3.8.3"
   },
   "dependencies": {
     "hoist-non-react-statics": "^3.3.2",