Added composer.json keywords
Added composer.json keywords

concrete5/flysystem,nao-pon/flysystem,dstockto/flysystem,sachintaware/flysystem,farmisen/flysystem,CarsonF/flysystem,twistor/flysystem,oswaldderiemaecker/flysystem,Amrit01/flysystem,WyriHaximus/Flysystem,dragoonis/Flysystem,mhlavac/flysystem,twistor/flysystem,mhlavac/flysystem,rossriley/flysystem,hannesvdvreken/flysystem,sohelrana820/flysystem,mapyo/flysystem,barryvdh/flysystem,dshafik/flysystem