underscore chain is not available in AboutApplyingWhatWeHaveLearnt.js

[made-by-chris]

console.log(_.chain)
yields undefined in my instance. Other underscore methods are available.

[jaimerosales]

Same here, Underscore.js introduced _.chain in version 1.2.4 and the Koans training is using 1.1.6.
What I did to fix it is to update the Underscore-min.js file with the latest version from underscorejs.org site. I will submit a pull request.
Cheers.