update changelog, the release was 0.3 not 0.2
update changelog, the release was 0.3 not 0.2

zopyx/pyfilesystem,pmitros/pyfs,rivenz/pyfilesystem,Konubinix/pyfilesystem,flying-circus/pyfilesystem,piranna/pyfilesystem,PyFilesystem/pyfilesystem,pmitros/pyfs,pombreda/pyfilesystem