Use cache to avoid changing the same title over and over

[fregante]

1. issue is opened
2. action re-titles it
3. user changes it back
4. GOTO 2

On step 4, it should detect that the same title was set and avoid changing it again. Or implement a delay somehow: if the title is changed, don't change it for the next 20 minutes.

[fregante]

I tried it, but restoreCache never returns undefined, so it seems to just run every time :(

• Allow overrides by the user title-replacer-action#4