Update GParted appdata file
Hi Curtis, Here's the fix for this. The commit message includes this text:
When Richard Hughes added the appdata file he licensed it under the GFDL but assigned the copyright to Curtis Gedak . Now change the license to CC0-1.0  as that is what most appdata files are reportedly licensed under . Curtis Gedak agrees to this by reviewing this change and being the committer of this commit.
Closes #12 (closed)