Fixed field name mismatch

Data and server used different names. Changed the data to match with
Items' "StackMax" field name.
Merge remote-tracking branch 'upstream/master'
Revert "Fixed field name mismatch"

This reverts commit a889c90224b6b35b67c35bf9f028d590749eb93f.
Merge pull request #11 from Pikachews/master

Fixed field name mismatch