Fix syntax error in composer.json example
Fix syntax error in composer.json example

The pdepend/pdepend was missing a trailing quote character.
pdepend/pdepend,manuelpichler/pdepend,kore/pdepend,manuelpichler/pdepend,kore/pdepend,torinaki/pdepend,JeroenDeDauw/pdepend,sustmi/pdepend,sustmi/pdepend,sustmi/pdepend,ravage84/pdepend,ravage84/pdepend,pdepend/pdepend,ravage84/pdepend,PortNumber53/pdepend,torinaki/pdepend,PortNumber53/pdepend,JeroenDeDauw/pdepend,PortNumber53/pdepend,kore/pdepend