Consider merging IP and port for clear explanation

[pscoem]

dnsproxy/config.yaml.dist

Lines 12 to 15 in f35ca3e

	listen-addrs:
	- "0.0.0.0"
	listen-ports:
	- 53

Current YAML have this:

listen-addrs:
  - "0.0.0.0"
listen-ports:
  - 53

and this is unclear - what will happen if I replace to:

listen-addrs:
  - "127.0.0.1"
  - "192.168.34.56"
listen-ports:
  - 53
  - 5353

will it open:

• 127.0.0.1:53
• 127.0.0.1:5353
• 192.168.34.56:53
• 192.168.34.56:5353

To avoid such confusion, why not merge IP and port like this:

server-listen:
  - "127.0.0.1:53"
  - "192.168.34.56:5353"