Move all references of old url to the new address (#622)

diff --git a/src/gen-use-table.py b/src/gen-use-table.py
index c18b1e0..e8acc56 100755
--- a/src/gen-use-table.py
+++ b/src/gen-use-table.py
@@ -301,10 +301,10 @@
 		# the nasalization marks, maybe only for U+1CE9..U+1CF1.
 		if U == 0x1CED: UISC = Tone_Mark
 
-		# TODO: https://github.com/behdad/harfbuzz/issues/525
+		# TODO: https://github.com/harfbuzz/harfbuzz/issues/525
 		if U == 0x1A7F: UISC = Consonant_Final; UIPC = Bottom
 
-		# TODO: https://github.com/behdad/harfbuzz/pull/609
+		# TODO: https://github.com/harfbuzz/harfbuzz/pull/609
 		if U == 0x20F0: UISC = Cantillation_Mark; UIPC = Top
 
 		values = [k for k,v in items if v(U,UISC,UGC)]