update Changelog

version bump

CHANGELOG.md

+## 2018-05-18 - Release 2.0.8
+### Summary
+
+#### Bugfixes
+- update rubocop configuration for version >= 0.53.0 of RuboCop
+- according to https://access.redhat.com/solutions/209553 do not enable rpcidmapd on RHEL 7
+
+#### Features
+- add server parameter to export define type
+- add easy local testing with beaker and docker
+
 ## 2018-02-21 - Release 2.0.7
 ### Summary
 

metadata.json

 {
   "name": "derdanne-nfs",
-  "version": "2.0.7",
+  "version": "2.0.8",
   "source": "https://github.com/derdanne/puppet-nfs.git",
   "author": "derdanne",
   "license": "Apache-2.0",