Upgrade semver from 6.3.0 to 6.3.1

[ingokpp]

Hi there,

I just checked out this repository to learn more about the overall architecture of heroicons, especially since I need to build my own iconset (mainly for React). While installing the dependencies I saw that semver needs to be updated to 6.3.1 due to a high severity vulnerability.

Here's the link to the vulnerability: https://security.snyk.io/package/npm/semver/6.3.0

I ran npm audit fix to fix this problem :)

[adamwathan]

Thanks — not actually a vulnerability to be concerned about to be clear because none of the relevant code is ever shipped to users but always good to keep these warnings quiet.