Update project react to 0.12.0

libgrabber updated project react to 0.12.0.

@facebook

### Metadata information

```json
{
  "metadata": {
    "packageManager": "npm",
    "name": "react",
    "repo": "facebook/react",
    "files": {
      "basePath": "dist/",
      "include": ["**/*"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/react",
    "localVersions": ["0.8.0", "0.9.0", "0.10.0", "0.11.0", "0.11.1", "0.11.2", "0.12.0-rc1"],
    "remoteVersions": ["0.0.1", "0.0.2", "0.0.3", "0.1.2", "0.2.0", "0.2.1", "0.2.2", "0.2.3", "0.2.4", "0.2.5", "0.2.6", "0.3.0", "0.3.4", "0.3.5", "0.5.0", "0.5.1", "0.5.2", "0.6.0", "0.6.1", "0.6.2", "0.6.3", "0.7.0", "0.7.1", "0.8.0", "0.9.0-rc1", "0.9.0", "0.10.0-rc1", "0.10.0", "0.11.0-rc1", "0.11.0", "0.11.1", "0.11.2", "0.12.0-rc1", "0.12.0"],
    "branchVersions": []
  },
  "version": "0.12.0",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/react/0.12.0",
  "branch": "react/0.12.0"
}
```