Merge pull request #2 from rccrdpccl/feature/curator-5.5

use curator 5.5.4

Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:3.6
 
 RUN apk --update add python py-setuptools py-pip && \
-    pip install elasticsearch-curator==5.4.1 && \
+    pip install elasticsearch-curator==5.5.4 && \
     pip install certifi && \
     apk del py-pip && \
     rm -rf /var/cache/apk/*