Meander warnings can generate lines longer than grbl .8 accepts

[razeh]

I'm using meander, which can generate this comment:

;WARNING! meander spacing updated from 3.175 to 2.778125

Which my grbl is unhappy with, because it is longer than 50 characters.

There is a fix for this in my wrap_fix branch.

[jminardi]

I just looked at your branch, it looks good. If you want to open a PR I can merge it.