Update handling for when username not configured

Sometimes a GitHub username / login was not given, so we can
now handle that by printing the name from the commit.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

derek.yml

@@ -3,9 +3,9 @@ provider:
   gateway: http://127.0.0.1:8080
 
 functions:
-  derek-098:
+  derek-0911:
     handler: ./
-    image: alexellis/derek:0.9.9
+    image: alexellis/derek:0.9.11
     lang: dockerfile
     environment:
       debug: true

handler/release_handler.go

@@ -83,19 +83,21 @@ func updateReleaseNotes(client *github.Client, owner, repo, latestTag string) er
 
 		author := c.GetAuthor().GetLogin()
 
-		if len(author) == 0 {
-			author = c.GetCommit().GetAuthor().GetLogin()
+		// log.Println("1", c.GetAuthor())
+		// log.Println("2", c.GetCommitter())
+		// log.Println("3", c.GetCommit().GetAuthor())
+
+		if len(author) > 0 {
+			author = " by @" + author
+		} else {
+			author = " by " + c.GetCommit().GetAuthor().GetName()
 		}
 
 		title := c.GetCommit().GetMessage()
 		if index := strings.Index(title, "\n"); index > -1 {
 			title = title[:index]
 		}
 
-		if len(author) > 0 {
-			author = "by @" + author
-		}
-
 		output = output + fmt.Sprintf("%s %s%s\n", id, title, author)
 	}