README.md: Upgrade Python (#2106)

https://devguide.python.org/versions

Author: cclauss

README.md

@@ -355,7 +355,7 @@ import * as _ from 'lodash';
   * check out https://github.com/cnpm/cnpm
 * node-pre-gyp ERR in npm install (Windows)
   * often happens when you're behind proxy and proxy wasn't configured in the npm as it tries to download binary package from the github and if it fails to do so, it will try to compile node-sass from the source codes
-  * install Python x86 version 2.x and on windows see issue [#626](https://github.com/gdi2290/angular-starter/issues/626)
+  * install Python3 x86
 * `Error:Error: Parse tsconfig error [{"messageText":"Unknown compiler option 'lib'.","category":1,"code":5023},{"messageText":"Unknown compiler option 'strictNullChecks'.","category":1,"code":5023},{"messageText":"Unknown compiler option 'baseUrl'.","category":1,"code":5023},{"messageText":"Unknown compiler option 'paths'.","category":1,"code":5023},{"messageText":"Unknown compiler option 'types'.","category":1,"code":5023}]`
   * remove `node_modules/typescript` and run `npm install typescript@beta`. This repo now uses ts 2.0
 * "There are multiple modules with names that only differ in casing"