adding missing export regexp-match->list (issue #419)

lib/srfi/115.sld

@@ -1,7 +1,7 @@
 (define-library (srfi 115)
   (export regexp regexp? valid-sre? rx regexp->sre char-set->sre
           regexp-matches regexp-matches? regexp-search
-          regexp-replace regexp-replace-all
+          regexp-replace regexp-replace-all regexp-match->list
           regexp-fold regexp-extract regexp-split regexp-partition
           regexp-match? regexp-match-count
           regexp-match-submatch