Update supported VS Code engine to 0.10.8

Author: daviwil

package.json

@@ -5,7 +5,7 @@
     "publisher": "ms-vscode",
     "description": "Develop PowerShell scripts in Visual Studio Code!",
     "engines": {
-        "vscode": "^0.10.7"
+        "vscode": "^0.10.8"
     },
     "license": "SEE LICENSE IN LICENSE.txt",
     "homepage": "https://github.com/PowerShell/vscode-powershell/blob/master/README.md",