WiFiClient - assignment shouldn't stop connection

there may be other copy of WiFiClient working with that connection.
let shared_ptr stop the connection when it is not refered anymore.

libraries/WiFi/src/WiFiClient.cpp

@@ -197,15 +197,6 @@ WiFiClient::~WiFiClient()
     stop();
 }
 
-WiFiClient & WiFiClient::operator=(const WiFiClient &other)
-{
-    stop();
-    clientSocketHandle = other.clientSocketHandle;
-    _rxBuffer = other._rxBuffer;
-    _connected = other._connected;
-    return *this;
-}
-
 void WiFiClient::stop()
 {
     clientSocketHandle = NULL;

libraries/WiFi/src/WiFiClient.h

@@ -71,7 +71,6 @@ class WiFiClient : public ESPLwIPClient
     {
         return connected();
     }
-    WiFiClient & operator=(const WiFiClient &other);
     bool operator==(const bool value)
     {
         return bool() == value;