Feature "When I delete other windows" and its test
Add missing newline
Some face-related steps and their unit tests

- current point should be in bold
- current point should be in italic
- current point should be in strike-through
- current point should be in underline
- current point should have the \\([-[:alnum:]]+\\) face
- current point should have no face
Remove useless `with-mock'
Use dash instead of cl-lib
Merge branch 'face-related-steps-3'
Merge branch 'delete-other-windows'
Release v0.3.0.