Update PowerShell to build with .NET Core SDK 2.1.4#6054

Merged

daxian-dbw merged 3 commits intoPowerShell:masterfrom

iSazonov:move-to-sdk214

Jan 31, 2018

Commits on Jan 28, 2018

[Feature] Update PowerShell to build with .NET Core SDK 2.1.4
iSazonov
committed

Commits on Jan 31, 2018

[Feature] Update appveyor.yml and .travis.yml to flush the cache
daxian-dbw
committed
[Feature] Update the .NET runtime version used in xUnit tests
daxian-dbw
committed