Delete branches on merge.

[BrianPugh]

Hey @geky! Just a project maintenance recommendation, go under the github settings an enable "Automatically delete head branches." And then maybe go back through and delete all the merged-in branches.

After pull requests are merged, you can have head branches deleted automatically.

[ ] Automatically delete head branches  
    Deleted branches will still be able to be restored.

[geky]

Ah, I'm not sure this will work since littlefs has a number of long-lived branches that occasionally get merged into each other (devel, v2, v2-prefix).

But I can go through and delete the merged branches, and change gears to habitually delete branches on merge.

Out of curiosity, does GitHub document how long deleted branches can be restored for? That's kind of a strange subdescription.