added dist/ to .gitignore
added dist/ to .gitignore

When using `./koch tools`, the directory `dist/` is generated (it contains the `nimble` sources).
The `dist` directory was added to .gitignore.
dom96/Nim,tulayang/Nim,tulayang/Nim,jfhg/Nim,jfhg/Nim,russpowers/Nim,dom96/Nim,dom96/Nim,dom96/Nim,russpowers/Nim,jfhg/Nim,dom96/Nim,russpowers/Nim,jfhg/Nim,tulayang/Nim,dom96/Nim,russpowers/Nim,jfhg/Nim,russpowers/Nim,dom96/Nim,jfhg/Nim,tulayang/Nim,tulayang/Nim,tulayang/Nim,russpowers/Nim,russpowers/Nim,jfhg/Nim