`sk --version` prints `sk` instead of version number

[rkanati]

At least as of v0.10.1,

$ sk --version

just prints sk instead of 0.10.1 or similar. Crucically, this breaks skim.vim, which uses the yielded version to ensure its requirements are met.

update: as of 0.10.2, sk --version prints sk 0.10.2 which is... better(?) but still breaks the version parsing in skim.vim.

[rkanati]

psa: https://github.com/wks/skim.vim appears to contain a fix for skim.vim