Update changelog

sandeepmistry · sandeepmistry · commit 72b1dc1a9b12 · 2016-11-17T17:38:21.000-05:00
diff --git a/CHANGELOG b/CHANGELOG
@@ -1,6 +1,7 @@
 SAMD CORE 1.6.9
 
  * MKR1000: Enabled PWM on pin 11, it is shared with pin A4
+ * SPI: Optimized SPI.transfer(...)
 
 SAMD CORE 1.6.8 2016.10.12
 
