Update alpine v3.3 / curator 3.4.1

Dockerfile

@@ -1,7 +1,7 @@
-FROM alpine:3.2
+FROM alpine:3.3
 
 RUN apk --update add python py-pip && \
-    pip install elasticsearch-curator==3.4.0 && \
+    pip install elasticsearch-curator==3.4.1 && \
     apk del py-pip && \
     rm -rf /var/cache/apk/*