Log Message:
py-djangocms-googlemap: updated to 1.4.0

1.4.0:
Added support for Django 3.0
Add rendering on plugin first insert capability

1.3.1 (unreleased)
Added further tests to raise coverage
Fixed smaller issues found during testing
Changed DecimalField field to FloatField for Marker plugin

1.3.0:
Added support for Django 2.2 and django CMS 3.7
Removed support for Django 2.0
Extended test matrix
Exclude tests folder from release build
Added installation instructions for django-filer