Version 0.4

• Initial mkdocs config (@jacobtoppm)
• Removed some unused code (@kaedroho)
• Tests (@kaedroho)
• Test with SQLite by default (@kaedroho)
• Tweaks to segment extraction (@kaedroho)
• Test on Django 3.0 and Wagtail 2.8 (@kaedroho)
• New revisions models. Change the way related objects are stored in translation memory (@kaedroho)
• Implement segment context (@kaedroho)
• Rename translation_memory app to translation (@kaedroho)
• Moved translation_engines into translation app (@kaedroho)
• Moved segment extraction/ingestion code into translation app (@kaedroho)
• Test on Django 2.1 (@kaedroho)