cordova-common patch release June 2018

A new cordova-common patch release is needed to deliver a single cordova-common package version with updated plist@3 dep, working on cordova-ios as well as cordova-android, cordova-windows, cordova-osx, cordova-lib, cordova-cli, etc.

More detailed discussion will be in the GH pull request.

Following steps at https://github.com/apache/cordova-coho/blob/master/docs/tools-release-process.md (with some minor adjustments)