Update elsevier (#769)

Add clinicalkey, scopus.com, etc.

data/elsevier

@@ -1,5 +1,6 @@
 # Elsevier's website,  One of the largest academic publishing companies
 
+clinicalkey.com
 els-cdn.com
 elsevier-ae.com
 elsevier.com
@@ -7,5 +8,8 @@ elsevier.io
 engineeringvillage.com
 evise.com
 fundinginstitutional.com
+knovel.com
+mendeley.com
+reaxys.com
 scival.com
 scopus.com