fix pylint issues

Author: FoamyGuy

examples/ht16k33_matrix_text_example.py

@@ -2,7 +2,6 @@
 
 # Requires: adafruit_framebuf
 
-import time
 import board
 import busio
 import adafruit_framebuf
@@ -43,4 +42,4 @@
                 bit = 1 << y & bite
                 # if bit > 0 then set the pixel brightness
                 if bit:
-                    matrix[16-x, y+1] = 1
+                    matrix[16-x, y+1] = 1