Issue #16 : Update dependencies
Issue #16 : Update dependencies

- io.prometheus:simpleclient ........... 0.4.0 -> 0.5.0
- io.prometheus:simpleclient_hotspot ... 0.4.0 -> 0.5.0
- io.prometheus:simpleclient_servlet ... 0.4.0 -> 0.5.0
- org.yaml:snakeyaml ................... 1.21 -> 1.23

marcelmay/hadoop-hdfs-fsimage-exporter,marcelmay/hadoop-hdfs-fsimage-exporter