vCompat Updater occasionally hits GitHub rate-limit

[bluelhf]

As seen in this review on LoginPlus:

vCompat's updater is fetching data from the GitHub API without authentication, which sometimes causes it to fail to start. To solve this issue, vCompat Updater must either

1. Use vCompat's own caching server, which caches the results from the GitHub API (optionally with its own token), or
2. Allow graceful failure if the GitHub API rate limit is reached — an exception should not be thrown.

[Lauriichan]

Normally it shouldn't just stop working

[Lauriichan]

I just checkd, if there is an exception when requesting the github version it will still continue if there is an existing version of vCompat already.