Update README.md

Update appdata releases

Work without lyricsources (#30)

* Move ILyricFile to interfaces folder

* Initial viewlyrics repository

* Meson: Add viewlyrics repository

* Add get_metadata to ILyricFile

* Implement get metadata method on ILyricFile implementations

* Complete port of viewlyrics source to vala

* Override file when saving a lyric

* ViewLyrics Repository: Stop returning null when a array is expected

* SearchLyricsDialog: Use ILyricFile interface

* SearchLyricsDialog: Ignore local lyric

* ViewLyrics Repository: Ignore text content type when building lyrics list

* Ignore xml validation

* Lyrics Repository: Fallback to native source if Lyricsources isn't available

* LyricSources: Return null if dbus can't find object

Bump version to 0.7.6

Bump version to 0.7.5

Release new version on AppData

Release version 0.7.4 with
* Fixes for window
* Updated translation source files

Release 0.7.3

Appdata: Fix date on release

Push version to 0.7.1

Push version to 0.7.0