Bump version to 0.38

Bump version to 0.37

Fixes an F-Droid build error:

Git checkout of 'v0.${versionCode}' failed
detail begin

error: pathspec 'v0.${versionCode}' did not match any file(s) known to git.
detail end

Bump version to 0.36

Bump version to 0.35

Bump version to 0.34

Bump version to 0.33

Bump version to 0.32

Bump version to 0.31

Enable java 8

Bump version to 0.29