feat: fix react version

Author: int64ago

README.md

@@ -10,7 +10,7 @@ Custom React Hooks for image natural size.
 
 >**Note:** The Hooks isn't stable now, the stable version will be available on [Q1 of 2019](https://reactjs.org/blog/2018/11/27/react-16-roadmap.html).
 >
->Make sure that you have installed the correct version of `react(>= v16.7.0-alpha)` and `react-dom(>= v16.7.0-alpha)`.
+>Make sure that you have installed the correct version of `react(v16.7.0-alpha.2)` and `react-dom(v16.7.0-alpha.2)`.
 
 ### npm
 

package.json

@@ -67,11 +67,11 @@
     ]
   },
   "dependencies": {
-    "react": "^16.7.0-alpha.2",
-    "react-dom": "^16.7.0-alpha.2"
+    "react": "16.7.0-alpha.2",
+    "react-dom": "16.7.0-alpha.2"
   },
   "peerDependencies": {
-    "react": "^16.7.0-alpha.0",
-    "react-dom": "^16.7.0-alpha.0"
+    "react": "16.7.0-alpha.2",
+    "react-dom": "16.7.0-alpha.2"
   }
 }