Removed raw ALTER TABLE in favour of alter_column
Removed raw ALTER TABLE in favour of alter_column

As @pigletto adviced me
pigletto/django-lfs,baffolobill/django-lfs,baffolobill/django-lfs,baffolobill/django-lfs,wisonwang/django-lfs,wisonwang/django-lfs,diefenbach/django-lfs,diefenbach/django-lfs,leadbrick/django-lfs,diefenbach/django-lfs,leadbrick/django-lfs,wisonwang/django-lfs,pigletto/django-lfs,pigletto/django-lfs,leadbrick/django-lfs