fix errors

cat.py

@@ -7,7 +7,7 @@ import urllib.request
 from io import BytesIO
 
 def cat(w, h):
-    url = f'https://cataas.com/cat/width={w}?height={h}?text=cat'
+    url = f'https://cataas.com/cat?width={w}?height={h}?text=cat'
     resp = urllib.request.urlopen(url)
     im_data = resp.read()
     im = Image.open(BytesIO(im_data))

pixelflut.py

@@ -45,7 +45,7 @@ with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
     # open image to be sent or query a cat image
     if  args.cat: im = cat(sizew,sizeh) 
     elif args.catsays: im = cat_says(args.catsays,sizew,sizeh) 
-    elif image in args: im = Image.open(args.image)
+    elif args.image: im = Image.open(args.image)
 
     pixels = list(im.getdata())
     width, height = im.size