0.7.0

• Improved documentation and release it to Read the documentation site;
• Built some diagrams for documentation with
  diagrams package <https://github.com/mingrammer/diagrams>_, a distinct makefile
  command diagrams has been added to build them into documentation static file
  directory;
• Added new "check" method to composer and processors to display output debugging about
  project composition;
• Moved all Django related stuff to contrib.django;
• Fixed RTD configuration to use Python3.8 to fix building;
• Changed Composer.find_app_module so it only emits log.debug instead of
  log.warning when it does not find a module;