build: Use typescript@latest

package.json

@@ -138,7 +138,7 @@
     "tslint-config-prettier": "^1.15.0",
     "tslint-consistent-codestyle": "^1.13.3",
     "tslint-react": "^3.6.0",
-    "typescript": "^3.1.0 || >=3.1.0-dev.20180901",
+    "typescript": "^3.0.3",
     "uglify-es": "^3.3.9",
     "uglifyjs-webpack-plugin": "^1.3.0",
     "url-loader": "^1.1.1",

yarn.lock

@@ -7145,9 +7145,9 @@ typeorm@^0.2.7:
     yargonaut "^1.1.2"
     yargs "^11.1.0"
 
-"typescript@^3.1.0 || >=3.1.0-dev.20180901":
+typescript@^3.0.3:
-  version "3.1.0-dev.20180901"
+  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.0-dev.20180901.tgz#732cbb9ae31e39930bdf05a855868640609b8c83"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.0.3.tgz#4853b3e275ecdaa27f78fda46dc273a7eb7fc1c8"
 
 ua-parser-js@^0.7.18:
   version "0.7.18"