Update version number to 2.18 for release
diff --git a/setup.py b/setup.py
index 07a62da..2ceb7b8 100644
--- a/setup.py
+++ b/setup.py
@@ -40,7 +40,7 @@
         C compilers or analysis tools.
     """,
     license='BSD',
-    version='2.17',
+    version='2.18',
     author='Eli Bendersky',
     maintainer='Eli Bendersky',
     author_email='eliben@gmail.com',