Change deprecated ANTIALIAS to LANCZOS

ANTIALIAS — not working 10+
LANCZOS — working since 2.6

Fix #64

pilkit/processors/resize.py

@@ -22,7 +22,7 @@ def __init__(self, width, height, upscale=True):
     def process(self, img):
         if self.upscale or (self.width < img.size[0] and self.height < img.size[1]):
             img = resolve_palette(img)
-            img = img.resize((self.width, self.height), Image.ANTIALIAS)
+            img = img.resize((self.width, self.height), Image.LANCZOS)
         return img