Commits on Jan 30, 2020

1. Add support for if_exists/if_not_exists on remove_column/add_column …

   This PR adds support for `if_exists` on `remove_column` and
   `if_not_exists` on `add_column` to support silently ignoring migrations
   if the remove tries to remove a non-existent column or an add tries to
   add an already existing column.
   
   We (GitHub) have custom monkey-patched support for these features and
   would like to upstream this behavior.
   
   This matches the same behavior that is supported for `create_table` and
   `drop_table`. The behavior for sqlite is different from mysql/postgres
   and sqlite for remove column and that is reflected in the tests.

   

   eileencodes committed Jan 30, 2020
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