Added new funcionality to README

Author: illarion

README.md

@@ -20,7 +20,7 @@
   * **TLS** - [TLS Termination](https://github.com/yyyar/gobetween/wiki/Protocols#tls) + [ACME](https://github.com/yyyar/gobetween/wiki/Protocols#tls) & [TLS Proxy](https://github.com/yyyar/gobetween/wiki/Tls-Proxying)
   * **UDP** - with optional virtual sessions
 
-  
+
 * [Clear & Flexible Configuration](https://github.com/yyyar/gobetween/wiki/Configuration) with [TOML](config/gobetween.toml) or [JSON](config/gobetween.json)
   * **File** - read configuration from the file
   * **URL** - query URL by HTTP and get configuration from the response body 
@@ -45,6 +45,7 @@
 * [Healthchecks](https://github.com/yyyar/gobetween/wiki/Healthchecks)
   * **Ping** - simple TCP ping healtcheck
   * **Exec** - execute arbitrary program passing host & port as options, and read healtcheck status from the stdout
+  * **Probe** - send specific bytes to backend (udp, tcp or tls) and expect correct answer (bytes or regexp)
 
 * [Balancing Strategies](https://github.com/yyyar/gobetween/wiki/Balancing) (with [SNI](https://github.com/yyyar/gobetween/wiki/Server-Name-Indication) support)
   * **Weight** - select backend from pool based relative weights of backends
@@ -94,6 +95,13 @@ Put `localhost:8000` and `localhost:8001` to `static_list` of static discovery i
 
 * `$ curl http://localhost:3000`
 
+Enable [profiler](https://blog.golang.org/profiling-go-programs) and debug issues you encounter
+```
+[profiler]
+enabled = true     # false | true
+bind    = ":6060"  # "host:port"
+```
+
 ## Performance
 It's Fast! See [Performance Testing](https://github.com/yyyar/gobetween/wiki/Performance-tests)