Incorrect filename for the Skype image

Signed-off-by: Michael Eshom <oldiesmann@oldiesmann.us>
Filename should be lowercase as that's how SMF expects it

Signed-off-by: Michael Eshom <oldiesmann@oldiesmann.us>
Merge pull request #538 from Oldiesmann/release-2.1

Incorrect name for Skype image