Merge pull request #121 from FoamyGuy/rainbow_period_property

public property for rainbow.period

adafruit_led_animation/animation/rainbow.py

@@ -123,3 +123,15 @@ class Rainbow(Animation):
         Resets the animation.
         """
         self._generator = self._color_wheel_generator()
+
+    @property
+    def period(self) -> float:
+        """
+        Period to cycle the rainbow over in seconds.
+        """
+        return self._period
+
+    @period.setter
+    def period(self, new_value: float) -> None:
+        self._period = new_value
+        self.reset()