v0.15.3

DataFramesMeta v0.15.3

Diff since v0.15.2

Merged pull requests:

• Add fix for by docs (#397) (@pdeffebach)
• Fix keyword argument bug (#400) (@pdeffebach)
• Fix tests for #400 (#401) (@pdeffebach)

Closed issues:

• Error in the @by example in the documentation (#396)
• Request - $AsTable with prefix (#398)
• kwargs not passed to subset in @subset with multiple conditions (#399)