Bump version to v2021.8.0-preview

Author: andyleejordan

package.json

@@ -1,7 +1,7 @@
 {
   "name": "powershell-preview",
   "displayName": "PowerShell Preview",
-  "version": "2021.7.0",
+  "version": "2021.8.0",
   "preview": true,
   "publisher": "ms-vscode",
   "description": "(Preview) Develop PowerShell modules, commands and scripts in Visual Studio Code!",
@@ -16,7 +16,7 @@
     "Snippets",
     "Linters"
   ],
-  "icon": "media/PowerShell_Icon.png",
+  "icon": "media/PowerShell_Preview_Icon.png",
   "galleryBanner": {
     "color": "#ACD1EC",
     "theme": "light"