docs,Windows: update Visual Studio requirements
See
@@ -77,15 +77,15 @@ To build C++ targets, you need:
You can install it in one of the following ways:
- * Install [Visual Studio](https://www.visualstudio.com/) (Community
- Edition is enough) with Visual C++.
+ * Install [Visual Studio 2015 or later](https://www.visualstudio.com/)
+ (Community Edition is enough) with Visual C++.
Make sure to also install the `Visual C++ > Common Tools for Visual C++`
and `Visual C++ > Microsoft Foundation Classes for C++` features. These
features are not installed by default.
* Install the [Visual C++ Build
- Tools](http://landinghub.visualstudio.com/visual-cpp-build-tools).
+ Tools 2015 or later](http://landinghub.visualstudio.com/visual-cpp-build-tools).
* The `BAZEL_VS` or `BAZEL_VC` environment variable.
