add snowballstemmer to requirements

diff --git a/requirements.txt b/requirements.txt
index 407b87f4789bfb0c30d01918fb95070c59e31c16..779c60903ebe577357896b76c493f2bad97dea87 100644 (file)
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,6 +7,7 @@ osmapi==1.2.2
 Paste==3.0.8\r
 requests==2.21.0\r
 six==1.12.0\r
+snowballstemmer==1.2.1\r
 soupsieve==1.9.1\r
 urllib3==1.24.3\r
 virtualenv==15.1.0\r