Update README.md

[Trudko]

Related to - Making the documentation in READ.me more noob friendly #68

[whitelynx]

If you installed thyme using go get -u github.com/sourcegraph/thyme/cmd/thyme (as the Install section suggests) you don't need ./, since it should be installed in your $GOPATH/bin directory. (if that directory isn't already in your $PATH, then you'd need to call it as $GOPATH/bin/thyme) Either way, the ./ doesn't seem appropriate unless you specifically downloaded the binary to a given directory and changed to that directory before running those commands.

[whitelynx]

I think #68 would be better served by adding a new command in the "Usage for Other Shells" section instead.