updated prereqs

requirements.txt

@@ -2,11 +2,11 @@ backports.ssl-match-hostname==3.5.0.1
 bcrypt==3.1.6
 cachetools==3.1.0
 certifi==2019.3.9
-cffi==1.12.2
+cffi==1.12.3
 chardet==3.0.4
 Click==7.0
 colorama==0.4.1
-croniter==0.3.29
+croniter==0.3.30
 dnspython==1.16.0
 enum34==1.1.6
 Flask==1.0.2
@@ -26,7 +26,7 @@ python-dateutil==2.8.0
 requests==2.21.0
 retrying==1.3.3
 six==1.12.0
-urllib3==1.24.1
+urllib3==1.24.2
 webencodings==0.5.1
 websocket-client==0.54.0
 Werkzeug==0.15.2