update README, another setup fix

Former-commit-id: dd41e61c57

README.txt

@@ -4,16 +4,32 @@ Author: Rob Speer
 
 ## License
 
-`wordfreq` is freely redistributable under the MIT license. See
-`MIT-LICENSE.txt`.
+`wordfreq` is freely redistributable under the MIT license (see
+`MIT-LICENSE.txt`), and it includes data files that may be
+redistributed under a Creative Commons Attribution-ShareAlike 4.0
+license (https://creativecommons.org/licenses/by-sa/4.0/).
 
-It contains data extracted from Google Books Ngrams
-(http://books.google.com/ngrams). The terms of use of this data are:
+`wordfreq` contains data extracted from Google Books Ngrams
+(http://books.google.com/ngrams) and Google Books Syntactic Ngrams
+(http://commondatastorage.googleapis.com/books/syntactic-ngrams/index.html).
+The terms of use of this data are:
 
     Ngram Viewer graphs and data may be freely used for any purpose, although
     acknowledgement of Google Books Ngram Viewer as the source, and inclusion
     of a link to http://books.google.com/ngrams, would be appreciated.
 
-It also contains data from the University of Leeds Centre for Translation
-Studies (see http://corpus.leeds.ac.uk/list.html), which is freely
-redistributable under a Creative Commons Attribution license.
+It also contains data derived from the following Creative Commons-licensed
+sources:
+
+- The Leeds Internet Corpus, from the University of Leeds Centre for Translation
+  Studies (http://corpus.leeds.ac.uk/list.html)
+
+- The OpenSubtitles Frequency Word Lists, by Invoke IT Limited
+  (https://invokeit.wordpress.com/frequency-word-lists/)
+
+- Wikipedia, the free encyclopedia (http://www.wikipedia.org)
+
+Some additional data was collected by a custom application that watches the
+streaming Twitter API, in accordance with Twitter's Developer Agreement &
+Policy. This software only gives statistics about words that are very commonly
+used on Twitter; it does not display or republish any Twitter content.

setup.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 from setuptools import setup
+import sys
 import os
 
 classifiers = [