Migrate to Kaleidoscope.use()

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

README.md

@@ -22,7 +22,7 @@ To use the plugin, one needs to include the header and select the effect.
 #include <Kaleidoscope-LED-Stalker.h>
 
 void setup (){
-  USE_PLUGINS(&StalkerEffect);
+  Kaleidoscope.use(&StalkerEffect);
 
   Kaleidoscope.setup();
 

examples/LED-Stalker/LED-Stalker.ino

@@ -41,7 +41,7 @@ const Key keymaps[][ROWS][COLS] PROGMEM = {
 };
 
 void setup() {
-  USE_PLUGINS(&LEDOff, &StalkerEffect);
+  Kaleidoscope.use(&LEDOff, &StalkerEffect);
 
   Kaleidoscope.setup();