Use kaleidoscope::Plugin as a base class, KaleidoscopePlugin is gone

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

src/Kaleidoscope/Redial.h

@@ -22,7 +22,7 @@
 
 namespace kaleidoscope {
 
-class Redial : public KaleidoscopePlugin {
+class Redial : public kaleidoscope::Plugin {
  public:
   Redial(void) {}