Simple-db-migrate

- Fix: support to python 3 on Windows

- Added: support to python 3.8

- Added: support to python 3.6 (test can be executed with python 2.7 and 3.6)

- Added: support to Django 1.10.0+
- Added: support to get database port and engine from Django settings
- Fix: accepting a dash on migration filename
- Fix: Oracle sql_up and sql_down type sizes
- Improvements on test suite

- Added: support procedure, trigger and function on mysql
- Added: parameter to show info about database
- Changed: ignore case on --env parameter value
- Changed: stop removing comments from sql statements on Oracle
- Fix: handle big db_version table on Oracle due to many migrations or big migrations SQL_UP/SQL_DOWN content

- Fix: support to execute python code when loading migrations and config files