Updated major build number (#289)
Updated major build number (#289)

* Update included version of Pester to 4.3.1
* Incremented major version for Pester extension as though this change of Pester version from 4.0.8 to 4.3.1 should be non breaking it does alter the task option drop downs

rfennell/vNextBuild,rfennell/vNextBuild,ChrisLGardner/vNextBuild,ChrisLGardner/vNextBuild,rfennell/vNextBuild,ChrisLGardner/vNextBuild,rfennell/vNextBuild,ChrisLGardner/vNextBuild