[arrayTools] fix mixed indentation

This particual file originally contained spaces, so we revert to that...
sorry.

Lib/fontTools/misc/arrayTools.py

@@ -121,6 +121,7 @@ def intRect(rect1):
     yMax = int(math.ceil(yMax))
     return (xMin, yMin, xMax, yMax)
 
+
 class Vector(object):
     """A math-like vector."""