doc: python info needs own header

Taylor D. Lee · rvagg · commit cca2d6672751 · 2019-04-24T10:29:00.000+10:00
PR-URL: #1245 Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com> Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Refael Ackermann <refack@gmail.com>
diff --git a/README.md b/README.md
@@ -55,8 +55,10 @@ Install tools and configuration manually:
 
    If the above steps didn't work for you, please visit [Microsoft's Node.js Guidelines for Windows](https://github.com/Microsoft/nodejs-guidelines/blob/master/windows-environment.md#compiling-native-addon-modules) for additional tips.
 
+### Configuring Python Dependency
+
 If you have multiple Python versions installed, you can identify which Python
-version `node-gyp` uses by setting the '--python' variable:
+version `node-gyp` uses by setting the `--python` variable:
 
 ``` bash
 $ node-gyp --python /path/to/python2.7
