peerDependencies on react should be 16.8.x (#5)

peerDependencies on react should be 16.8.x

Author: kitten

package.json

@@ -57,8 +57,8 @@
  }
  },
  "peerDependencies": {
- "react": "^16.6.0",
- "react-is": "^16.6.0"
+ "react": "^16.8.0",
+ "react-is": "^16.8.0"
  },
  "devDependencies": {
  "@babel/core": "^7.3.4",