Update project proact.js to 1.2.1

libgrabber updated project proact.js to 1.2.1.

@proactjs

### Metadata information

```json
{
  "metadata": {
    "packageManager": "bower",
    "name": "proact.js",
    "repo": "proactjs/proactjs",
    "files": {
      "basePath": "dist/js",
      "exclude": ["proact.js"],
      "include": ["**/*"]
    },
    "path": "/home/jsdelivr/files/proact.js",
    "localVersions": ["0.4.2", "0.4.3", "1.0.0", "1.1.0", "1.1.1", "1.2.0"],
    "remoteVersions": ["0.4.1", "0.4.2", "0.4.3", "1.0.0", "1.1.0", "1.1.1-snapshot", "1.1.1", "1.2.0", "1.2.1"],
    "branchVersions": []
  },
  "version": "1.2.1",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/proact.js/1.2.1",
  "branch": "proact.js/1.2.1"
}
```