feat(package.json): update to react@^15.0.0

* Permit React 15-rc to be included as a peer dependency.
* Update to 15.0.0 instead of the release candidate version.
* Closes #243

package.json

@@ -1,7 +1,7 @@
 {
   "__template__gist__": "https://gist.github.com/tomchentw/368a93bb748ad9d576f1#file-package-json",
   "name": "react-google-maps",
-  "version": "4.9.1",
+  "version": "4.9.2",
   "description": "React.js Google Maps integration component",
   "main": "lib/index.js",
   "files": [
@@ -92,7 +92,7 @@
     "warning": "^2.1.0"
   },
   "peerDependencies": {
-    "react": "^0.14.0",
-    "react-dom": "^0.14.0"
+    "react": "^0.14.0 || ^15.0.0",
+    "react-dom": "^0.14.0 || ^15.0.0"
   }
 }