Update version 2.19 --> 2.20
diff --git a/setup.py b/setup.py
index 62eddc2..6dce89c 100644
--- a/setup.py
+++ b/setup.py
@@ -43,7 +43,7 @@
         C compilers or analysis tools.
     """,
     license='BSD',
-    version='2.19',
+    version='2.20',
     author='Eli Bendersky',
     maintainer='Eli Bendersky',
     author_email='eliben@gmail.com',