Upstream moved from http://www.cis.upenn.edu/~bcpierce/unison/ to https://www.seas.upenn.edu/~bcpierce/unison/ as mentioned on https://alliance.seas.upenn.edu/~bcpierce/cgi-bin/unison.cgi?REDIRECT=http%253A%252F%252Falliance.seas.upenn.edu%252F%257Ebcpierce%252Fcgi-bin%252Funison.cgi&BUTTON=All+available+versions just replace all csi with seas in HOMEPAGE and SRC_URI
Replaced. Thansks.