[4.9.0] 2019-09-21

Fixed

• Fix hashtable references so strict mode works when set in the psakeFile.
• #283 Fix path issue for msbuild is VS 2019. (via @jaymclain)
• #287 In Exec function, always rerun command in specified location (via @tiksn and @UberDoodles)

Added

• #281 Support for .Net 4.8 in Framework function (via @granit1986)
• #285 Add BuildSetup and BuildTearDown functions that are executed at the beginning of the build (before the first task), and at the end of the build (after either all tasks have completed, or a task has failed). (via @UberDoodles)