Avoid releasing non-x.x.x versions

[dhalbert]

I recently bought a new NanoVNA-H, which was loaded with https://github.com/hugen79/NanoVNA-H/releases/tag/1.1.

NanoVNA-Saver's Version.py did not like this x.x version number, and complained with "Unable to parse version: 1.1". The unrecognized version may have caused some problems fetching data from the NanoVNA-H: I was getting scan values that did not match what the unit was reporting on the screen.

I fixed the problem by updating to https://github.com/hugen79/NanoVNA-H/releases/tag/1.1.01.

I'm not sure whether NanoVNA-Saver should support non-x.x.x version numbers, or whether https://github.com/hugen79/NanoVNA-H should avoid non-x.x.x releases. Probably both is good. I filed an issue on NanoVNA-Saver as well: NanoVNA-Saver/nanovna-saver#483.