Fix .gitignore

[ghost]

Description

• The .gitignore file includes version.php, therefore when we commit the xAPI plugin to our internal Moodle repo, it does not include version.php, which is of course a required file for Moodle. Whilst we can manually modify the .gitignore, the source then deviates from the plugin, potentially resulting in merge conflicts. Regardless, the version.php file should not be in .gitignore anyway.

Version

• master at e5be1b7e55d16e3bba244e91f663cb75169a8a50 on 2018082100

Steps to reproduce the bug

1. Copy the xAPI plugin into an existing Moodle Git repository
2. Push this to the remote

Expected behaviour

• version.php should be included, without needing to modify .gitignore

Actual behaviour

• version.php is not pushed, as it is in .gitignore.