unitialized end time (#413)

src/internal/Ws2801GenericMethod.h

@@ -68,6 +68,8 @@ public:
     void Initialize(int8_t sck, int8_t miso, int8_t mosi, int8_t ss)
     {
         _wire.begin(sck, miso, mosi, ss);
+
+        _endTime = micros();
     }
 #endif