Merge branch 'feature/upgrade' into 'master'

Feature/upgrade

See merge request bigfang/horn-py!15

fix UT

decimal numeric to numeric in model layer

update readme

Merge branch 'dev/poetry' into 'master'

Dev/poetry

Closes #22

See merge request bigfang/horn-py!13

upgrade to 0.5.0

fix new --bare

cli new support '.' as target, fix #18

Merge branch 'enhance/add-tests' into 'master'

Enhance/add tests

Closes #6 and #17

See merge request bigfang/horn-py!9

using pathlib instead os.path, correct package configure

foreign key support add default parameter