trailing space in LICENSE.md line 65

Line 65 of the license file ending in "can be bundled, embedded, " has a trailing space. (I'm only bringing this nit up as I had to update this to appease format checkers in another project.)

Also, is there a reason why source-serif-4.005_Desktop.zip includes the license file but source-serif-4.005_WOFF.zip and source-serif-4.005_WOFF2.zip do not?