Fix - removeColumn in change() instead of up()
Fix - removeColumn in change() instead of up()

Method removeColumn() is not supported in change() method according to http://docs.phinx.org/en/latest/migrations.html#the-change-method.
ikagawa/phinx,daniel-gomes-sociomantic/phinx,robmorgan/phinx,rquadling/phinx,Thamrongsak/phinx