v0.4.1

TidierDB v0.4.1

Diff since v0.4.0

• Adds 50 tests comparing TidierDB to TidierData to assure accuracy across a complex chains of operations, including combinations of @mutate, @summarize, @filter, @select, @group_by and @join operations.
• fixes some edge case bugs that came up writing these tests with if_else/case_when assigning missing value

Merged pull requests:

• add 50 tests comparing tidierdata and tidierdb (#69) (@drizk1)