v0.3.9-rc01

Merge pull request NanoVNA-Saver#384 from akinad3/update_markers

Add new s21 markers for |Z| and R+jX

upgrade pyinstaller

Merge pull request NanoVNA-Saver#306 from NanoVNA-Saver/testing

v0.3.7

Merge pull request NanoVNA-Saver#261 from NanoVNA-Saver/Development

v0.3.6

Merge pull request NanoVNA-Saver#225 from NanoVNA-Saver/Development

v0.3.4

Bump Version

Merge pull request NanoVNA-Saver#30 from zarath/feature/v0.3.3

Version bump / CHANGELOG

Merge pull request NanoVNA-Saver#195 from NanoVNA-Saver/Development

v0.3.1 fixes assited calibration crash