go mod vendor. add lumberjack.

go.mod

@@ -66,6 +66,7 @@ require (
 	github.com/mitchellh/hashstructure v1.0.0
 	github.com/mitchellh/mapstructure v1.1.2
 	github.com/mssola/user_agent v0.5.0 // indirect
+	github.com/natefinch/lumberjack v2.0.0+incompatible
 	github.com/nats-io/gnatsd v1.2.0
 	github.com/nats-io/go-nats v1.5.0
 	github.com/nats-io/go-nats-streaming v0.4.0 // indirect
@@ -94,6 +95,7 @@ require (
 	github.com/siddontang/go v0.0.0-20180604090527-bdc77568d726
 	github.com/siddontang/go-mysql v0.0.0-20190808080311-dd15a3c6
 	github.com/simplereach/timeutils v1.2.0 // indirect
+	github.com/sirupsen/logrus v1.4.2
 	github.com/smartystreets/goconvey v0.0.0-20190731233626-505e41936337 // indirect
 	github.com/tv42/httpunix v0.0.0-20150427012821-b75d8614f926 // indirect
 	github.com/uber/jaeger-client-go v2.16.0+incompatible

go.sum

@@ -338,6 +338,8 @@ github.com/mssola/user_agent v0.5.0/go.mod h1:UFiKPVaShrJGW93n4uo8dpPdg1BSVpw2P9
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/myesui/uuid v1.0.0 h1:xCBmH4l5KuvLYc5L7AS7SZg9/jKdIFubM7OVoLqaQUI=
 github.com/myesui/uuid v1.0.0/go.mod h1:2CDfNgU0LR8mIdO8vdWd8i9gWWxLlcoIGGpSNgafq84=
+github.com/natefinch/lumberjack v2.0.0+incompatible h1:4QJd3OLAMgj7ph+yZTuX13Ld4UpgHp07nNdFX7mqFfM=
+github.com/natefinch/lumberjack v2.0.0+incompatible/go.mod h1:Wi9p2TTF5DG5oU+6YfsmYQpsTIOm0B1VNzQg9Mw6nPk=
 github.com/nats-io/gnatsd v1.2.0 h1:WKLzmB8LyP4CiVJuAoZMxdYBurENVX4piS358tjcBhw=
 github.com/nats-io/gnatsd v1.2.0/go.mod h1:nqco77VO78hLCJpIcVfygDP2rPGfsEHkGTUk94uh5DQ=
 github.com/nats-io/go-nats v1.5.0 h1:OrEQSvQQrP+A+9EBBxY86Z4Es6uaUdObZ5UhWHn9b08=