add circleci.com build

Author: brettwooldridge

.circleci/config.yml

@@ -0,0 +1,10 @@
+jobs:
+  build: # name of your job
+    machine: true # executor type
+    resource_class: brettwooldridge/ubuntu
+
+    steps:
+      # Commands run in a Linux virtual machine environment
+      - checkout
+      - run: mvn clean package
+

README.md

@@ -180,9 +180,9 @@ The following limitations exist in NuProcess:
  * Java 7 and above
  * Linux support requires at least kernel version 2.6.17 or higher (kernels after June 2006)
 
-[Build Status]:https://travis-ci.org/brettwooldridge/NuProcess
-[Build Status img]:https://travis-ci.org/brettwooldridge/NuProcess.svg?branch=master
-
+[Build Status]:https://circleci.com/gh/brettwooldridge/NuProcess`
+[Build Status img]:https://circleci.com/gh/brettwooldridge/NuProcess.svg?style=shield
+`
 [Shippable Status]:https://app.shippable.com/github/brettwooldridge/NuProcess
 [Shippable Status img]:https://api.shippable.com/projects/5b4b6a3e6db3b807000a63d8/badge?branch=master