reports/GO-2020-0004.yaml: add exported symbols

Output of `vulnreport fix`

Change-Id: Id6077364e3a10a17fca2ce9d0ec27881f5782ae7
Reviewed-on: https://go-review.googlesource.com/c/vulndb/+/381755
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
diff --git a/reports/GO-2020-0004.yaml b/reports/GO-2020-0004.yaml
index 140c38d..02f8114 100644
--- a/reports/GO-2020-0004.yaml
+++ b/reports/GO-2020-0004.yaml
@@ -14,6 +14,9 @@
   - Auth.ServerHTTP
   - Auth.ListenAndServeTLS
   - Auth.ListenAndServe
+derived_symbols:
+  - ListenAndServe
+  - ListenAndServeTLS
 links:
     pr: https://github.com/nanobox-io/golang-nanoauth/pull/5
     commit: https://github.com/nanobox-io/golang-nanoauth/commit/063a3fb69896acf985759f0fe3851f15973993f3