v1.5.1 to update to arduino.tips

### Releases v1.5.1

1. Change from `arduino.cc` to `arduino.tips` in HTTP examples
2. Add `lib_ldf_mode = chain+` in `platformio.ini`

Author: khoih-prog

examples/WebClient/WebClient.ino

@@ -11,7 +11,7 @@
 
 #include "defines.h"
 
-char server[] = "arduino.cc";
+char server[] = "arduino.tips";
 
 // Initialize the Web client object
 EthernetClient client;
@@ -68,7 +68,7 @@ void setup()
     Serial.println(F("Connected to server"));
     // Make a HTTP request
     client.println(F("GET /asciilogo.txt HTTP/1.1"));
-    client.println(F("Host: arduino.cc"));
+    client.println(F("Host: arduino.tips"));
     client.println(F("Connection: close"));
     client.println();
   }

examples/WebClientRepeating/WebClientRepeating.ino

@@ -11,7 +11,7 @@
 
 #include "defines.h"
 
-char server[] = "arduino.cc";
+char server[] = "arduino.tips";
 
 unsigned long lastConnectionTime = 0;         // last time you connected to the server, in milliseconds
 const unsigned long postingInterval = 10000L; // delay between updates, in milliseconds
@@ -35,7 +35,7 @@ void httpRequest()
 
     // send the HTTP PUT request
     client.println(F("GET /asciilogo.txt HTTP/1.1"));
-    client.println(F("Host: arduino.cc"));
+    client.println(F("Host: arduino.tips"));
     client.println(F("Connection: close"));
     client.println();