readme: updated docs

doc.go

@@ -6,6 +6,5 @@
 // features. With gocqlx you can bind the query parameters from maps and
 // structs, use named query parameters (:identifier) and scan the query results
 // into structs and slices. It comes with a fluent and flexible CQL query
-// builder that supports full CQL spec, including BATCH statements and custom
-// functions.
+// builder and a database migrations module.
 package gocqlx