Update README

Author: gwenn

README

@@ -1,3 +1,5 @@
 SQLite extensions that uses glib2/icu to provide a regex_replace() function.
-The glib code was adapted from the pcre match implementation by Alexey Tourbin:
+* The glib code was adapted from the pcre match implementation by Alexey Tourbin:
 http://git.altlinux.org/people/at/packages/?p=sqlite3-pcre.git
+* The icu code was adapted from SQLite official extension:
+https://github.com/sqlite/sqlite/blob/master/ext/icu/icu.c