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/HTTPClient/SimpleHTTPExample/SimpleHTTPExample.ino

@@ -17,7 +17,7 @@
 
 // This example downloads the URL "http://arduino.cc/"
 // Name of the server we want to connect to
-const char kHostname[] = "arduino.cc";
+const char kHostname[] = "arduino.tips";
 
 // Path to download (this is the bit after the hostname in the URL
 // that you want to download