Merge pull request #413 from AlisProject/ALIS-5194

security fix

Author: hayago

requirements.txt

@@ -4,7 +4,7 @@ hashids==1.2.0
 bleach==3.1.4
 rfc3987==1.3.8
 jinja2==2.10.1
-pillow==6.2.0
+pillow>=6.2.2
 aws-requests-auth==0.4.2
 requests_aws4auth==0.9
 elasticsearch==6.2.0
@@ -15,4 +15,4 @@ requests_oauthlib==1.2.0
 responses==0.10.6
 web3==5.0.0
 hexbytes==0.2.0
-pytz==2019.3
+pytz==2019.3