FreeBSD CI support (nxadm#23)

FreeBSD CI support

Author: nxadm

.cirrus.yml

@@ -0,0 +1,8 @@
+task:
+  name: FreeBSD
+  freebsd_instance:
+      image_family: freebsd-12-2
+  install_script: pkg install -y go
+  script: |
+    go build
+    go test -v -race ./...

README.md

@@ -1,12 +1,13 @@
-![ci](https://github.com/nxadm/tail/workflows/ci/badge.svg)[![Go Reference](https://pkg.go.dev/badge/github.com/nxadm/tail.svg)](https://pkg.go.dev/github.com/nxadm/tail)
-
+[![Go Reference](https://pkg.go.dev/badge/github.com/nxadm/tail.svg)](https://pkg.go.dev/github.com/nxadm/tail)
+![ci](https://github.com/nxadm/tail/workflows/ci/badge.svg)
+[![FreeBSD](https://api.cirrus-ci.com/github/nxadm/tail.svg)](https://cirrus-ci.com/github/nxadm/tail)
 # tail functionality in Go
 
 nxadm/tail provides a Go library that emulates the features of the BSD `tail`
 program. The library comes with full support for truncation/move detection as
 it is designed to work with log rotation tools. The library works on all
-operating systems supported by Go, including POSIX systems like Linux and
-*BSD, and MS Windows. Go 1.9 is the oldest compiler release supported.
+operating systems supported by Go, including POSIX systems like Linux, *BSD,
+MacOS, and MS Windows. Go 1.9 is the oldest compiler release supported.
 
 A simple example:
 
@@ -41,4 +42,4 @@ nxadm/tail continues the development by keeping up to date with the Go toolchain
 and fixing bugs.
 
 ## Examples
-Examples, e.g. used to debug an issue, are kept in the [examples directory](/examples).
+Examples, e.g. used to debug an issue, are kept in the [examples directory](/examples).