README: Document Python 3 support

bgilbert · bgilbert · commit 559a145ae2bd · 2013-07-31T03:00:24.000-04:00
Closes #3.
diff --git a/README.txt b/README.txt
@@ -1,8 +1,8 @@
 OpenSlide Python requires:
 
-* Python 2 >= 2.6
+* Python 2 >= 2.6 or Python 3 >= 3.3
 * OpenSlide >= 3.3.0
-* Python Imaging Library
+* Python Imaging Library or Pillow
 
 To install:
 
