Add flag to curl invocation to follow redirects

Because GitHub has evidently changed the location of the referenced files and is redirecting to them with a 301 Moved Permanently, the command lines as-is will not work today. Adding the -L flag to follow redirects seems to do the trick, though you may want to consider also replacing the URLs with their new canonical values.

Thanks for the great tool!
Merge pull request #13 from danielpunkass/patch-1

Add flag to curl invocation to follow redirects