Release 0.9.7

Fixes crash while searching on modern Rubies.

s/GNU Source Highlight/highlight/

Prefer highlight to GNU Source Highlight.

GNU Source Highlight's development seems to have stopped early 2015, and lacks highlighting for a number of things I care about.

Release 0.9.5

Changes since 0.9.4
-------------------
91ee054 TODO: Re-prioritize
abdba84 Merge branch 'walles/more-vim-keys'
20bb791 Rubocop: Link to issue behind disabled cop
b80fa56 Upgrade Rubocop to 0.48.1
4f18b66 TODO: Re-prioritize
f9522cd Release message: Add a heading to the changes list
2156ec9 README: Improve install instructions

Release 0.9.4

cd38747 Fix release versioning