Go >= 1.9 is required

[nathany]

Which operating system (GOOS) and version are you using?

Linux. See job https://travis-ci.org/fsnotify/fsnotify/jobs/594068880

Please describe the issue that occurred.

The sys package (dependency) requires math/bits, which in turn requires Go 1.9 or greater.
https://github.com/golang/sys/blob/master/unix/affinity_linux.go

Fetching https://golang.org/x/sys/unix?go-get=1
Parsing meta tags from https://golang.org/x/sys/unix?go-get=1 (status code 200)
get "golang.org/x/sys/unix": found meta tag main.metaImport{Prefix:"golang.org/x/sys", VCS:"git", RepoRoot:"https://go.googlesource.com/sys"} at https://golang.org/x/sys/unix?go-get=1
get "golang.org/x/sys/unix": verifying non-authoritative meta tag
Fetching https://golang.org/x/sys?go-get=1
Parsing meta tags from https://golang.org/x/sys?go-get=1 (status code 200)
golang.org/x/sys (download)
package math/bits: unrecognized import path "math/bits" (import path does not begin with hostname)

Are you able to reproduce the issue? Please provide steps to reproduce and a code sample if possible.

See job https://travis-ci.org/fsnotify/fsnotify/jobs/594068880

[nathany]

Does anyone need Go 1.8 support? Should we just update the Travis CI file and move on?

[nathany]

Also add minimum version to the README.