package/wavemon: bump to version 0.9.4

Use the new LICENSE file added in version 0.9.3 with
https://github.com/uoaerg/wavemon/commit/2251870415c5be3850ce59d99d0e352e55a3280a
as COPYING has been dropped with
https://github.com/uoaerg/wavemon/commit/bfa12c46c773e5fe49ec4f91fc6260aa4f66e258
The text has been updated with https URLs.

https://github.com/uoaerg/wavemon/releases/tag/v0.9.2
https://github.com/uoaerg/wavemon/releases/tag/v0.9.3
https://github.com/uoaerg/wavemon/releases/tag/v0.9.4



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>