v1.21.0

New features:
- select command supports log view specific options and
  there is a new keyboard shortcut to select the latest commit: ^
  commit 2e6202d961935faaf354d625244e694c549c504d
- commits are counted but displaying the numbers is not enabled by default
  you can enable them with `set log-view.commit-number-enable=true` if you want
  commit b430e7cefde507d8342a2b20359fc60454957503
- there is a new command echo which you can use to display the values of settings
  commit cad94d6707c7b76a001167125e842a5be3af8833
- or the commit number
  commit bab09aa74312956b5599f28e2c638def1f7e48f5

Bugfixes:
- don't use ^ in keyboard shortcuts as align character
  ^ is now displayed as <caret>
  commit 2a0a38add8835c5164572260ff7f6903b7ecec94
- don't use newest urwid version
  to avoid an immediate crash
  commit 635923be4e55356f2deca0e44d24687b4cded59e