Stop using USE_PLUGINS

Use `Kaleidoscope.use` instead, because `USE_PLUGINS` is getting deprecated.

Signed-off-by: Gergely Nagy <kaleidoscope@gergo.csillger.hu>

README.md

@@ -51,7 +51,7 @@ void someFunction(void) {
 }
 
 void setup(void) {
-  USE_PLUGINS(&HostOS);
+  Kaleidoscope.use(&HostOS);
 
   Kaleidoscope.setup ();
 }

examples/HostOS/HostOS.ino

@@ -41,7 +41,7 @@ const Key keymaps[][ROWS][COLS] PROGMEM = {
 void setup() {
   Serial.begin(9600);
 
-  USE_PLUGINS(&HostOS);
+  Kaleidoscope.use(&HostOS);
 
   Kaleidoscope.setup();