v0.8.9

Please install v0.8.10, there is a bug in this version.

1. Can be pinned to taskbar (fix #44 #56 #68 #80).

If your wsl-terminal version number is higher than 0.8.0, can upgrade it with ./cmdtool update (usage).

sha256sum	filename
58a8afb1d6cc7974d58a66301a7204e401bbc8bd41c3528eb652f0c5c627fe80	wsl-terminal-0.8.9.7z
e19464552b0aa66eb4087b589b4f96301728226a28a2d67bacf88b3868f02427	wsl-terminal-0.8.9.zip