Fix requirements

package.json

@@ -15,9 +15,9 @@
   "author": "Lucas de Souza",
   "license": "MIT",
   "devDependencies": {
-    "ts-loader": "^5.2.1",
-    "typescript": "^3.1.1",
-    "webpack": "^4.20.2",
-    "webpack-cli": "^3.1.2"
+    "ts-loader": "^5.*",
+    "typescript": "^3.*",
+    "webpack": "^4.*",
+    "webpack-cli": "^3.*"
   }
 }