anchor.diff:      version = 3;
       owner = "libp2p";
       repo = "go-libp2p-host";
  -    date = "2017-11-14";
  -    rev = "ee3f912d7676d976b878fddc04a02be66a2da5ee";
  -    sha256 = "1dyxzn29f38vnv1j51k4p4zsvgadllbj28azb8dngj6kglmsz115";
  +    date = "2017-12-05";
  +    rev = "bb2f9de697e574146834c22a81abf67fe2deb7b2";
  +    sha256 = "19azqvf0639b2gp2m1yz3ji2rwpz4bajswc16sc2nx53fzb5q0b8";
       propagatedBuildInputs = [
         go-libp2p-interface-connmgr
         go-libp2p-net
  
positive.code:     sha256 = "0qsrllh5w8qxslvwgb8pd9n35jv2p2wscnsqjbqwn77b2lnw78i4";
      buildInputs = [
        errors
        kit
        kingpin_v2
        net
        prometheus_client_model
  
negative.code:     owner = "go-kit";
      repo = "kit";
      sha256 = "1v28lsb4n921zylska4ca8cz11sgs2jzcgcyr8ciap5mv5i1xj01";
      subPackages = [
        "log"
        "log/level"
        "metrics"
        "metrics/expvar"
        "metrics/generic"
        "metrics/influx"
        "metrics/internal/lv"
        "metrics/prometheus"
      ];
      propagatedBuildInputs = [
        gohistogram
        influxdb_client
        logfmt
        prometheus_client_golang
        stack
      ];
    };
  
    kit_for_prometheus = kit.override {
      subPackages = [
        "log"
        "log/level"
  