fix: npm registry with deno update syntax

[levibostian]

Fixes: #96

udd takes a npm import npm:ical-generator@^4.0.0 and converts that to npm:[email protected]#^ from this line of code

The npm regex gives you the version string of 4.0.0#^ which SemVer() fails at.

This PR fixes the problem by getting the version from npm:[email protected]#^ to return 4.0.0 instead of 4.0.0#^.

[levibostian]

Huh. I guess github will not let you reopen a PR once the branch has been force pushed.

I had to keep this closed and open a new one. #109