Fix enum schema

[collerek]

0.11.2

🐛 Fixes

• Fix database drivers being required, while they should be optional #713
• Fix boolean field problem in limit queries in postgres without limit_raw_sql flag #704
• Fix enum_class spilling to schema causing errors in OpenAPI #699

[codecov-commenter]

Codecov Report

Merging #715 (a2c6980) into master (d18fa76) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #715    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          187       189     +2     
  Lines        15621     15722   +101     
==========================================
+ Hits         15621     15722   +101     

Impacted Files	Coverage Δ
ormar/fields/model_fields.py	100.00% <100.00%> (ø)
ormar/queryset/actions/order_action.py	100.00% <100.00%> (ø)
tests/test_fastapi/test_enum_schema.py	100.00% <100.00%> (ø)
tests/test_relations/test_foreign_keys.py	100.00% <100.00%> (ø)
...ations/test_postgress_select_related_with_limit.py	100.00% <100.00%> (ø)