doc: drop support for VS2015

PR-URL: #16868
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

BUILDING.md

@@ -41,7 +41,7 @@ in production.
 |--------------|--------------|----------------------------------|----------------------|------------------|
 | GNU/Linux    | Tier 1       | kernel >= 2.6.32, glibc >= 2.12  | x86, x64, arm, arm64 |                  |
 | macOS        | Tier 1       | >= 10.10                         | x64                  |                  |
-| Windows      | Tier 1       | >= Windows 7 / 2008 R2           | x86, x64             | vs2015 or vs2017 |
+| Windows      | Tier 1       | >= Windows 7 / 2008 R2           | x86, x64             | vs2017           |
 | SmartOS      | Tier 2       | >= 15 < 16.4                     | x86, x64             | see note1        |
 | FreeBSD      | Tier 2       | >= 10                            | x64                  |                  |
 | GNU/Linux    | Tier 2       | kernel >= 3.13.0, glibc >= 2.19  | ppc64le >=power8     |                  |
@@ -76,7 +76,7 @@ Depending on host platform, the selection of toolchains may vary.
 
 #### Windows
 
-* Visual Studio 2015 or Visual C++ Build Tools 2015 or newer
+* Visual Studio 2017 or the Build Tools thereof
 
 ## Building Node.js on supported platforms
 
@@ -192,16 +192,11 @@ $ [sudo] make install
 Prerequisites:
 
 * [Python 2.6 or 2.7](https://www.python.org/downloads/)
-* One of:
-  * [Visual C++ Build Tools](http://landinghub.visualstudio.com/visual-cpp-build-tools)
-  * [Visual Studio 2015 Update 3](https://www.visualstudio.com/), all editions
-    including the Community edition (remember to select
-    "Common Tools for Visual C++ 2015" feature during installation).
-  * The "Desktop development with C++" workload from
-    [Visual Studio 2017](https://www.visualstudio.com/downloads/) or the
-    "Visual C++ build tools" workload from the
-    [Build Tools](https://www.visualstudio.com/downloads/#build-tools-for-visual-studio-2017),
-    with the default optional components.
+* The "Desktop development with C++" workload from
+  [Visual Studio 2017](https://www.visualstudio.com/downloads/) or the
+  "Visual C++ build tools" workload from the
+  [Build Tools](https://www.visualstudio.com/downloads/#build-tools-for-visual-studio-2017),
+  with the default optional components.
 * Basic Unix tools required for some tests,
   [Git for Windows](http://git-scm.com/download/win) includes Git Bash
   and tools which can be included in the global `PATH`.