minor bug in smcp feature

[frankrolf]

This (https://github.com/adobe-fonts/source-sans-pro/blob/master/Roman/family.fea#L621) line
sub [i.trk germandbls iogonek.d] by [Idotaccent.sc Germandbls.sc Iogonek.sc];
needs to become
sub [i.trk germandbls iogonek.d] by [Idotaccent.sc germandbls.sc Iogonek.sc];

InDesign still does the right thing, but not all editors might.

[erniemarch]

Checked in Roman version 2.034. This is corrected in the source feature file.

[miguelsousa]

Fixed in version 2.040.