Update README [fixes #56]
Update README [fixes #56]

Be more clear that easy_thumbnails is a dependency.
henriquechehad/django-image-cropping,henriquechehad/django-image-cropping,winzard/django-image-cropping,winzard/django-image-cropping,winzard/django-image-cropping,henriquechehad/django-image-cropping