Update project angular-gantt to v1.0.0-rc8

libgrabber updated project angular-gantt to v1.0.0-rc8.

@angular-gantt

### Metadata information

```json
{
  "metadata": {
    "packageManager": "github",
    "name": "angular-gantt",
    "repo": "angular-gantt/angular-gantt",
    "files": {
      "basePath": "dist/",
      "include": ["*.min.*"],
      "exclude": []
    },
    "path": "/home/jsdelivr/files/angular.gantt",
    "localVersions": ["1.0.0-rc4", "1.0.0-rc5", "1.0.0-rc6", "1.0.0-rc7"],
    "remoteVersions": ["v0.1", "v0.2", "v0.3", "v0.4", "v0.4.2", "v0.4.3", "v0.5", "v0.5.0", "v0.5.1", "v0.6.0", "v.0.6.1", "v0.6.1", "v0.6.2", "v0.6.3", "v0.6.4", "v0.7.0", "v1.0.0-rc.9", "v1.0.0-rc1", "v1.0.0-rc2", "v1.0.0-rc3", "v1.0.0-rc4", "v1.0.0-rc5", "v1.0.0-rc6", "v1.0.0-rc7", "v1.0.0-rc8"],
    "branchVersions": []
  },
  "version": "v1.0.0-rc8",
  "updated": true,
  "updatePath": "/home/jsdelivr/files/angular.gantt/1.0.0-rc8",
  "branch": "angular-gantt/v1.0.0-rc8"
}
```