[fix] Fix loalize issue due to missing requirements

requirements.txt

@@ -1,5 +1,5 @@
 Django>=1.8.17,<1.9
-psycopg2==2.5.2
+psycopg2==2.5.4
 python-ldap==2.4.15
 wsgiref==0.1.2
 python-dateutil==2.2
@@ -16,3 +16,4 @@ feedparser
 six==1.10.0
 WeasyPrint==0.31
 freezegun==0.3.8
+pytz>=2018.5