Update boto3 requirement from ~=1.11.1 to ~=1.11.14 (#278)

dependabot-preview[bot] · web-flow · commit 6102840b20ff · 2020-02-12T00:03:11.000+01:00
diff --git a/requirements/requirements.txt b/requirements/requirements.txt
@@ -1,4 +1,4 @@
-boto3~=1.11.1
+boto3~=1.11.14
 marshmallow==3.4.0
 PyYAML>=5.1,<5.4
 requests==2.22.0
