Bump the version number to the next release as an alpha (microsoft#422)

Author: brettcannon

package.json

@@ -2,7 +2,7 @@
 "name": "python",
 "displayName": "Python",
 "description": "Linting, Debugging (multi-threaded, remote), Intellisense, code formatting, refactoring, unit tests, snippets, and more.",
-"version": "0.9.0",
+"version": "2018.1.0-alpha",
 "publisher": "ms-python",
 "author": {
 "name": "Microsoft Corporation"