remove on-update from join-column
Merge pull request #1064 from stefanotorresi/update-xsd

remove on-update from join-column
Minor CS fixes (`use` statements compliant with PSR-2)
Corrected FQCN reference in `@expectedException`
Replacing `"` with `'` to avoid escaping warnings
`on-update` is not supported anymore
Merge branch 'hotfix/#1064-xsd-on-update-removal'