Change HTTP to HTTPS.

Change HTTP to HTTPS to avoid plaintext HTTP connections.

docs/build-instructions/windows.md

@@ -9,7 +9,7 @@
     * For 64-bit builds of node and native modules you **must** have the
     [Windows 7 64-bit SDK](http://www.microsoft.com/en-us/download/details.aspx?id=8279).
     You may also need the [compiler update for the Windows SDK 7.1](http://www.microsoft.com/en-us/download/details.aspx?id=4422)
-  * [Python](http://www.python.org/download/) v2.7.
+  * [Python](https://www.python.org/downloads/) v2.7.
     * The python.exe must be available at `%SystemDrive%\Python27\python.exe`.
       If it is installed elsewhere, you can create a symbolic link to the
       directory containing the python.exe using:
@@ -19,7 +19,7 @@
 ### On Windows 8
   * [Visual Studio Express 2013 for Windows Desktop](http://www.visualstudio.com/en-us/downloads/download-visual-studio-vs#DownloadFamilies_2)
   * [node.js](http://nodejs.org/download/) v0.10.x
-  * [Python](http://www.python.org/download/) v2.7.x (required by [node-gyp](https://github.com/TooTallNate/node-gyp))
+  * [Python](https://www.python.org/downloads/) v2.7.x (required by [node-gyp](https://github.com/TooTallNate/node-gyp))
   * [GitHub for Windows](http://windows.github.com/)
 
 ## Instructions