Release v1.0.0

Added

• Lint checks for test docs using the arrange/act/assert pattern
• Lint checks for longer descriptions of each stage
• --test-docs-pattern argument to customise the docstring pattern
• --test-docs-filename-pattern argument to customise the test file discovery
• --test-docs-function-pattern argument to customise the test function
  discovery
• support for flake8 --indent-size argument