Update sqlalchemy from 1.3.1 to 1.3.2

Author: pyup-bot

requirements-dev.txt

@@ -13,7 +13,7 @@ pytest-cov==2.6.1
 pytest-sugar==0.9.2
 pytest==4.4.0
 python-dateutil==2.8.0
-sqlalchemy==1.3.1
+sqlalchemy==1.3.2
 trafaret==1.2.0
 pymysql==0.9.3
 -r requirements-doc.txt