altimeter/unity, branch master

altimeter/unity, branch master AVR code for an in-progress pressure altimeter Add missing submodule ref 2021-02-08T06:00:21+00:00 David Phillips david@yeah.nah.nz 2021-02-08T06:00:21+00:00 14f2f9c63ed49a135e662d476079ea6e840d173d Forgot to add this on the previous commit when the submodule was added to .gitmodules

Forgot to add this on the previous commit when the submodule was added to
.gitmodules