libtermkey: 0.19 -> 0.20
libtermkey: 0.19 -> 0.20

Semi-automatic update. These checks were performed:

- built on NixOS
- found 0.20 with grep in /nix/store/4sswlqrcz5y3s241l0vgrbsyzcrl9gn5-libtermkey-0.20
- found 0.20 in filename of file in /nix/store/4sswlqrcz5y3s241l0vgrbsyzcrl9gn5-libtermkey-0.20

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