Simplify/update some dev dependencies versions

Author: MoOx

package.json

@@ -6,7 +6,7 @@
   },
   "peerDependencies": {
     "@react-native-community/slider": "^3.0.0",
-    "reason-react": "^0.8.0",
+    "reason-react": "^0.9.0",
     "reason-react-native": "^0.62.0"
   },
   "repository": "https://github.com/reason-react-native/slider.git",
@@ -37,12 +37,12 @@
     "release": "npmpub"
   },
   "devDependencies": {
-    "bs-platform": "^7.3.0",
-    "husky": "^1.3.0",
-    "lint-staged": "^10.1.1",
+    "bs-platform": "^8.0.0",
+    "husky": "^4.0.0",
+    "lint-staged": "^10.0.0",
     "npmpub": "^5.0.0",
-    "prettier": "^1.18.0",
-    "reason-react": "^0.8.0",
+    "prettier": "^2.0.0",
+    "reason-react": "^0.9.0",
     "reason-react-native": "^0.62.0"
   },
   "prettier": {