Style: typo:

Juanita De La Cuesta · Juanita De La Cuesta · commit 1d8329fa5641 · 2019-01-11T13:29:23.000+01:00
diff --git a/signature/signature_test.go b/signature/signature_test.go
@@ -226,7 +226,7 @@ func TestValidate(t *testing.T) {
 			k:   testKey,
 			ts:  testTs,
 			s:   testSignature,
-			sh:  sHeader
+			sh:  sHeader,
 			tsh: "wrong-header",
 			e:   http.StatusUnauthorized,
 		},
