Upgrade dependencies

requirements.txt

@@ -1,10 +1,10 @@
 atoma==0.0.11
 attrs==18.2.0
 beautifulsoup4==4.6.3
-bleach==3.0.0
+bleach==3.0.1
 blinker==1.4
-boto3==1.9.18
-botocore==1.12.18
+boto3==1.9.19
+botocore==1.12.19
 certifi==2018.8.24
 chardet==3.0.4
 defusedxml==0.5.0
@@ -30,6 +30,6 @@ requests-oauthlib==1.0.0
 s3transfer==0.1.13
 six==1.11.0
 spinach==0.0.6
-urllib3==1.22
+urllib3==1.23
 waitress==1.1.0
 webencodings==0.5.1