Increment version to v0.4.3

Add usability notice to README.md

Increment version to 0.4.2

Only send Discord webhook on main branch build

Increment version to 0.4.1

Merge branch 'release'

Increment version to v0.4.0-RC6

Increment version to 0.4.0-RC5

Organise desktop build, increment version to 0.4.0-RC4

Increment version to 0.4.0-RC3