Added a few keywords in setup.py

Author: smarie

setup.py

@@ -37,7 +37,7 @@
 version_for_download_url = get_version()
 DOWNLOAD_URL = URL + '/tarball/' + version_for_download_url
 
-KEYWORDS = 'mini minimal lambda expr expression simple print string'
+KEYWORDS = 'mini minimal lambda expr expression simple print string func function symbol symbolic'
 # --Get the long description from the README file
 # with open(path.join(here, 'README.md'), encoding='utf-8') as f:
 #    LONG_DESCRIPTION = f.read()