Merge pull request #11 from jpecor/patch-1

Update to fill/outline color check

Author: makermelissa

adafruit_button.py

@@ -112,7 +112,7 @@ def __init__(self, *, x, y, width, height, name=None, style=RECT,
         if self.selected_outline is None and outline_color is not None:
             self.selected_outline = (~self.outline_color) & 0xFFFFFF
 
-        if outline_color or fill_color:
+        if (outline_color is not None) or (fill_color is not None):
             if style == Button.RECT:
                 self.body = Rect(x, y, width, height,
                                  fill=self.fill_color, outline=self.outline_color)