Add HTTP delete method (#8214)

Author: behroozbc

libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.cpp

@@ -354,6 +354,14 @@ int HTTPClient::GET()
 {
     return sendRequest("GET");
 }
+/**
+ * send a DELETE request
+ * @return http code
+ */
+int HTTPClient::DELETE()
+{
+    return sendRequest("DELETE");
+}
 
 /**
  * sends a post request to the server

libraries/ESP8266HTTPClient/src/ESP8266HTTPClient.h

@@ -187,6 +187,7 @@ class HTTPClient
 
     /// request handling
     int GET();
+    int DELETE();
     int POST(const uint8_t* payload, size_t size);
     int POST(const String& payload);
     int PUT(const uint8_t* payload, size_t size);