Update README.md
Apply #8166 to master so folks can build v2.3.2
Bump Recess to v1.1.8 to fix further less.js version problems

Apparently Recess v1.1.7 had another problem:
https://github.com/twitter/recess/pull/100
Merge pull request #8242 from cvrebert/patch-1

Apply #8166 to master so folks can build a non-empty v2.3.2