Fix syntax error

The code of the section 'repository' contains a syntax error.

This (^ shows the error):
```json
"repository: {
           ^
   "type": "git", "url": "git://github.com/foo/bar.git"
}"
 ^
```
should be:

```json
"repository": {
   "type": "git", "url": "git://github.com/foo/bar.git"
}
```