Updated README with correct install from composer.
Updated README with correct install from composer.

alirezarahmani/DoctrineModule,UFOMelkor/DoctrineModule,Bilge/DoctrineModule,Bilge/DoctrineModule,vasildakov/DoctrineModule,doctrine/DoctrineModule,marek1989/DoctrineModule,mpalourdio/DoctrineModule,gencer/DoctrineModule,malukenho/DoctrineModule,malukenho/DoctrineModule,netiul/DoctrineModule,UFOMelkor/DoctrineModule,inbaz/DoctrineModule