Add tweet() function

Author: vshymanskyy

README.md

@@ -73,7 +73,7 @@ lua ./examples/client.lua <your_auth_token>
 - `virtualWrite`
 - `syncVirtual`
 - `setProperty`
-- `notify`
+- `notify`, `tweet`
 - `logEvent`
 - events: `Vn`, `readVn`, `connected`, `disconnected`
 - `TCP` and secure `TLS/SSL` connection support

blynk.lua

@@ -69,6 +69,10 @@ function Blynk:notify(msg)
   self:sendMsg(COMMAND.notify, nil, msg)
 end
 
+function Blynk:tweet(msg)
+  self:sendMsg(COMMAND.tweet, nil, msg)
+end
+
 function Blynk:logEvent(evt, descr)
   self:sendMsg(COMMAND.event, nil, table.concat({evt, descr}, '\0'))
 end