Add sourcetracker/0.9.5

Signed-off-by: Alan Orth <alan.orth@gmail.com>
qiime/1.8.0: Add sourcetracker dependency

Signed-off-by: Alan Orth <alan.orth@gmail.com>
Add stringtie/0.98

Signed-off-by: Alan Orth <alan.orth@gmail.com>