Fixed time units in example of config.xml in README.md
Fixed time units in example of config.xml in README.md

mk23/jmxproxy-test,mk23/jmxproxy-test,mk23/jmxproxy-test,mk23/jmxproxy-test,mk23/jmxproxy,mk23/jmxproxy-test,mk23/jmxproxy-test,mk23/jmxproxy,mk23/jmxproxy,mk23/jmxproxy,mk23/jmxproxy,mk23/jmxproxy