Use syslog hook in example_hook_test.go

[thsnr]

Currently example_hook_test.go uses gopkg.in/gemnasium/logrus-airbrake-hook.v2 to demonstrate using hooks. This is a very heavy import and with the introduction of Go modules will propagate to all projects using logrus.

For example, if I set logrus as a dependency to my Go module and run go build then the following build dependencies are added to my requirements:

github.com/sirupsen/logrus v1.0.6
golang.org/x/crypto v0.0.0-20180820150726-614d502a4dac // indirect

However, when running go mod tidy to add all transitive dependencies (including testing), then I get these following additional lines:

github.com/davecgh/go-spew v1.1.1 // indirect
github.com/fsnotify/fsnotify v1.4.7 // indirect
github.com/golang/protobuf v1.2.0 // indirect
github.com/hpcloud/tail v1.0.0 // indirect
github.com/onsi/ginkgo v1.6.0 // indirect
github.com/onsi/gomega v1.4.1 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/stretchr/testify v1.2.2 // indirect
golang.org/x/net v0.0.0-20180821023952-922f4815f713 // indirect
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f // indirect
golang.org/x/text v0.3.0 // indirect
gopkg.in/airbrake/gobrake.v2 v2.0.9 // indirect
gopkg.in/fsnotify.v1 v1.4.7 // indirect
gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2 // indirect
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
gopkg.in/yaml.v2 v2.2.1 // indirect

All because of gopkg.in/gemnasium/logrus-airbrake-hook.v2.

I suggest using github.com/sirupsen/logrus/hooks/syslog in the example instead: it demonstrates using hooks just as well and does not result in any additional dependencies.

[dgsb]

Indeed