Update project terra to 1.3.1-beta

libgrabber updated project terra to 1.3.1-beta.

@rileyjshaw

### Metadata information

```json
{
  "metadata": {
    "packageManager": "bower",
    "name": "terra",
    "repo": "rileyjshaw/terra",
    "files": {
      "basePath": "dist/",
      "include": ["terra.min.js"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/terra",
    "localVersions": ["1.3.0-beta"],
    "remoteVersions": ["1.0.0-alpha", "1.0.0-beta", "1.1.0-beta", "1.2.0-beta", "1.3.0-beta", "1.3.1-beta"],
    "branchVersions": []
  },
  "version": "1.3.1-beta",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/terra/1.3.1-beta",
  "branch": "terra/1.3.1-beta"
}
```