dbt-expectations v0.4.1

Fixes

• expect_table_columns_to_match_list removed '' to leave columns as numbers (#98)

• expect_table_columns_to_match_ordered_list now explicitly casts the column list to a string type (#99)

• Fixed regex matching tests for Redshift by adding a Redshift specific adapter macro in regexp_instr ([#99](#102 @mirosval)