0.7.7

What's Changed

• Remove 'partition_by' requirement from 'group_by' method by @dreadatour in #649
• Support 'case' operator inside functions by @dreadatour in #651
• Add test for 'group_dy' without 'partition_by' by @dreadatour in #650

Full Changelog: 0.7.6...0.7.7