pin to [email protected] in readme - refs documentationjs/documentation#850 #150

Author: Dane Springmeyer

README.md

@@ -45,10 +45,12 @@ make distclean
 # This skel uses documentation.js to auto-generate API docs.
 # If you'd like to generate docs for your code, you'll need to install documentation.js,
 # and then add your subdirectory to the docs command in package.json
-npm install -g documentation
+npm install -g documentation@4.0.0
 npm run docs
 ```
 
+NOTE: we are pinned to `[email protected]` because 5.x removed C++ support: https://github.com/documentationjs/documentation/blob/master/CHANGELOG.md#500-2017-07-27
+
 ### Customizing the compiler toolchain
 
 By default we use `clang++` via [mason](https://github.com/mapbox/mason). The reason we do this is: