color.c: fix color_parse_mem() with value_len == 0

diff --git a/RelNotes b/RelNotes
index 84a20c84c648cacea6b2cbdab43d36e92aaaa5c8..62615ffa4e97803da96aefbc798ab50f949a8db7 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/2.6.0.txt
\ No newline at end of file
+Documentation/RelNotes/2.10.0.txt
\ No newline at end of file