Merge pull request #21 from sdurrheimer/master

Update to 5.2.0

Dockerfile

@@ -1,8 +1,10 @@
 FROM alpine:3.4
 
 RUN apk --update add python py-setuptools py-pip && \
-    pip install elasticsearch-curator==5.1.1 && \
+    pip install elasticsearch-curator==5.2.0 && \
+    pip install requests-aws4auth && \
     apk del py-pip && \
     rm -rf /var/cache/apk/*
 
+USER nobody:nobody
 ENTRYPOINT ["/usr/bin/curator"]