py-django-sql-explorer: updated to 1.1.3

1.1.3:
- URL-friendly parameter encoding
- Updating dependency reference for Python 3 compatibility
- Include database views in list of tables
- Fix unicode issue when generating migration with py2 or py3
- Do not use "message" attribute on exception
- Update EXPLORER_SCHEMA_EXCLUDE_TABLE_PREFIXES

- Minor Changes
  - release checklist included in repo
  - readme updated with new screenshots
  - python dependencies/optional-dependencies updated to latest
    - six, xlsxwriter, factory-boy, sqlparse

(adam)