message: Add FreeBSD build status
diff: @@ -10,6 +10,7 @@ Current Build Status
  - Linux and OSX: [![Build Status](https://travis-ci.org/opcm/pcm.svg?branch=master)](https://travis-ci.org/opcm/pcm)
  - Windows: [![Build status](https://ci.appveyor.com/api/projects/status/0ytkojay9r0o6sxy?svg=true)](https://ci.appveyor.com/project/opcm/pcm)
  +- FreeBSD: [![Build Status](https://api.cirrus-ci.com/github/opcm/pcm.svg)](https://cirrus-ci.com/github/opcm/pcm)
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  PCM Tools
  