Log Message:
textproc/bat: Updates to 0.15.0

Changes since 0.14.0:

Features

  * This release adds a new --diff/-d option that can be used to only show lines
    surrounding Git changes, i.e. added, removed or modified lines. The amount of
    additional context can be controlled with --diff-context=N. See #23 and #940

Bugfixes

  * Error message printed in the middle of the output for another file, see #946
  * Performance improvements when using custom caches (via bat cache --build): the
    bat startup time should now be twice as fast (@lzutao).

Themes

  * Updated version of the Solarized dark/light themes, see #941

bat as a library

  * There are a few changes in the "low level" API (the Config struct \ 
has changed and
    the error handler needs a new &mut dyn Write argument). The high-level \ 
API is not
    affected.