add react-native 0.18.0-rc as PeerDependency

Author: omulet

package.json

@@ -30,7 +30,7 @@
  },
  "homepage": "https://github.com/oblador/react-native-lightbox",
  "peerDependencies": {
- "react-native": ">=0.11.0 || 0.11.0-rc || 0.12.0-rc || 0.13.0-rc"
+ "react-native": ">=0.11.0 || 0.11.0-rc || 0.12.0-rc || 0.13.0-rc || 0.18.0-rc"
  },
  "dependencies": {
  "react-timer-mixin": "^0.13.3"