We used to attempt to create a package for the files but this will
change the import behavior only when bundled. Instead, the error
prompts the library author to fix it by combining the files or
creating a package.
based versions that are semver compatible. If a prerelease
identifier is already present we'll bump ahead by adding `.plus.`
and the number of subsequent commits. If its not, we'll bump the
patch digit and call it `alpha.0` and add the remaining `.plus.` bit.
This also changes the file names of the mpy zips to include "-mpy-"
which should help space out two potentially confusing version strings
(that of circuitpython and that of the library.)
