compiler warnings removed.

src/OneButton.h

@@ -17,6 +17,7 @@
 // 26.09.2018 Anatoli Arkhipenko: Included solution to use library with other
 // sources of input.
 // 26.09.2018 Initialization moved into class declaration.
+// 26.09.2018 Jay M Ericsson: compiler warnings removed.
 // -----
 
 #ifndef OneButton_h
@@ -82,11 +83,11 @@ class OneButton
 
 private:
  int _pin; // hardware pin number.
- int _debounceTicks = 50; // number of ticks for debounce times.
- int _clickTicks = 600; // number of ticks that have to pass by
- // before a click is detected.
- int _pressTicks = 1000; // number of ticks that have to pass by before a long
- // button press is detected
+ unsigned int _debounceTicks = 50; // number of ticks for debounce times.
+ unsigned int _clickTicks = 600; // number of ticks that have to pass by
+  // before a click is detected.
+ unsigned int _pressTicks = 1000; // number of ticks that have to pass by
+  // before a long button press is detected
 
  int _buttonPressed;