v0.8.12

1. Upgrade mintty to 2.9.5.
2. Upgrade fatty to 3a2e677.

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

sha256sum	filename
3301d51fe91a1581aa77faa4945cf1ca58c539ce4ac5082308662700fca9b606	wsl-terminal-0.8.12.7z
14f522f803175ae308416c5662d2302ed7f4a42397d0550e6bc00723739ed0f3	wsl-terminal-0.8.12.zip
2d03c43c6d932b4da1f67de4dda0541fb1133b7c61aa95a3d72fe31ad744b592	wsl-terminal-tabbed-0.8.12.7z
10c0833257d073b60374c84d305327f89f8ba598e41e794bc4f3f59320d005e7	wsl-terminal-tabbed-0.8.12.zip