Changelog for vgrep-0.2.3.0

Changelog

Replace lens dependency with microlens for faster builds
Compatibility with GHC 8.4 to 8.10, stackage LTS-12 to LTS-17
Explicitly passing a tty to the editor process, rather than stdin, to work around a vim bug

Add support for aeson 1.x to enable build with Stackage LTS 9.x
Add less-like keybindings Ctrl-u, Ctrl-d (half-page-up/down, only in pager) and Ctrl-b, Ctrl-f (full-page-up/down).

Added support for a config file: A YAML file located at ~/.vgrep/config.yaml is recognized as configuration file for colors, keybindings and other settings. The default config file can be produced using vgrep --dump-default-config > ~/.vgrep/config.yaml.
Added support for colorized input (ANSI CSI/SGR escape codes). vgrep can now be used together wit grep --color=always (and git grep --color=always), which is now enabled by default when using vgrep as drop-in replacement for grep.

User events (like key events) now have priority over other events, the UI does not block any more.
--help and --version now produce sensible output.