Simplify/update some dev dependencies versions

Author: MoOx

package.json

@@ -36,9 +36,9 @@
   },
   "devDependencies": {
     "bs-platform": "^8.0.0",
-    "husky": "^1.3.0",
-    "lint-staged": "^10.1.1",
-    "prettier": "^1.18.0",
+    "husky": "^4.0.0",
+    "lint-staged": "^10.0.0",
+    "prettier": "^2.0.0",
     "reason-react": "^0.9.0",
     "reason-react-native": "^0.62.0"
   },