Update neotrellis.py

Add auto_write (default true) and sync method

Author: meh2481

adafruit_neotrellis/neotrellis.py

@@ -66,6 +66,7 @@ def __init__(
         addr=_NEO_TRELLIS_ADDR,
         drdy=None,
         brightness=1.0,
+        auto_write=True,
     ):
         super().__init__(i2c_bus, addr, drdy)
         self.interrupt_enabled = interrupt
@@ -77,6 +78,7 @@ def __init__(
             _NEO_TRELLIS_NUM_KEYS,
             brightness=self._brightness,
             pixel_order=GRB,
+            auto_write=auto_write,
         )
 
     def activate_key(self, key, edge, enable=True):
@@ -103,6 +105,10 @@ def sync(self):
                 ):
                     self.callbacks[evt.number](evt)
 
+    def show(self):
+        """Show the NeoPixels on the Trellis"""
+        self.pixels.show()
+
     @property
     def brightness(self):
         """The NeoPixel brightness level of the board."""