Release 0.10.0

Major changes in 0.10.0

• We now do shallow clones of git repos when downloading if possible.
• The way the cache works internally was slightly tweaked which will cause all existing caches to be rebuilt.

$ sha256sum flatpak-builder-0.10.0.tar.xz 
956bfc842ebe226524b4ce987a2c9b1d2923d8eedb4658f8992e4699f85c0712  flatpak-builder-0.10.0.tar.xz