Update README.md

Author: Mygod

Diff for: README.md

@@ -59,8 +59,13 @@ ss-local -c config.json -p 443 --plugin v2ray-plugin --plugin-opts "mode=quic;ho
 
 ### Issue a cert for TLS and QUIC
 
+v2ray-plugin will look for TLS certificates signed by [acme.sh](https://github.com/Neilpang/acme.sh) by default.
+Here's some sample commands for issuing a certificate.
+
 ```sh
-curl  https://get.acme.sh | sh
+curl https://get.acme.sh | sh
 sudo apt-get -y install socat
 sudo ~/.acme.sh/acme.sh --issue -d mydomain.me --standalone -k 4096
 ```
+
+Alternatively, you can specify path to your certificates using option `cert` and `key`.