Update version number to 1.18

setup.py

@@ -27,7 +27,7 @@ from setuptools import setup, find_packages
 
 setup(
     name='ligo-raven',
-    version='1.17',
+    version='1.18',
     url='http://gracedb.ligo.org',
     author='Alex Urban',
     author_email='alexander.urban@ligo.org',