Fixed typo

asciiWriter/patterns.py

@@ -60,7 +60,7 @@ def image (path, threshold=128):
   try:
     from PIL import Image
   except ImportError:
-    print('The image patter requires pillow to be installed.')
+    print('ERROR: The image pattern requires Pillow to be installed.\nInstall using `pip install pillow`')
     exit()
 
   im = Image.open(path).convert('L')