Merge pull request #76 in DNS/adguard-dns from single_binary to master

* commit '880ad362a849cc53729128b614a4d4cc1d696750':
  Makefile -- use variable for target binary
  coredns plugin -- remove debug logging
  single binary -- coredns also tries to parse arguments, it kills itself on unknown flags
  Update makefile to build only one binary instead of two
  WIP -- single binary -- works, replies to DNS, but need to check what got broken

app.go

@@ -117,6 +117,11 @@ func main() {
 		}
 	}
 
+	// eat all args so that coredns can start happily
+	if len(os.Args) > 1 {
+		os.Args = os.Args[:1]
+	}
+
 	err := writeConfig()
 	if err != nil {
 		log.Fatal(err)