fix: add missing throws parameter to golang validator [closes #87]

[jdalton]

Parsing certain Go package URLs crashes instead of validating them. The golang validator refers to a variable named throws that was never declared in its signature, so as soon as that branch is reached Node raises ReferenceError: throws is not defined — a hard crash from inside a library whose whole job is to parse untrusted strings safely.

Adding the missing throws parameter, which every other type validator already takes, restores the intended behavior: an invalid version is reported the normal way instead of taking the caller down with it.

Closes #87.

What the tests pin — the crash case, plus the three shapes that must keep parsing

A new golang describe block covers both directions, so the fix cannot regress into over-rejecting:

Case	Expected
v1.0.invalid	throws, with the "must be followed by a valid semver version" message
v1.0.0	accepted
v0.0.0-20210922020428-25de7278fc84 (pseudo-version)	accepted
version with no v prefix	accepted