chore: Update README (#132)

Adds more detail about connecting ton-http-api to the local liteserver.

README.md

@@ -146,6 +146,7 @@ To point the HTTP API to your own lite server you should set `TON_API_TONLIB_LIT
     ```
     python -c 'import codecs; f=open("liteserver.pub", "rb+"); pub=f.read()[4:]; print(str(codecs.encode(pub,"base64")).replace("\n",""))'
     ```
+- The config generated with `mytonctrl` > `installer` > `clcf` adds the public IP of your server in the config file. If there's an active firewall on your server, `ton-http-api` won't be able to connect to the local lite server. In that case, replace the value of lite server's `ip` in `local.config.json` with `2130706433`, which is the integer equivalent of `127.0.0.1` / `localhost`.
 - Once config file is created assign variable `TON_API_TONLIB_LITESERVER_CONFIG` to its path, run `./configure.py` and rebuild the project.
 
 #### How to run multiple API instances on single machine?