Correct sentence in README
Merge pull request #95 from deivid-rodriguez/patch-1

Correct sentence in README
Revert "No need to check for bundler? if checking for defined?(::Bundlier)"

This reverts commit 441086bbac0e7519d3b7588998e43d49c6a24f20.
Bump to 2.1.3

Fix #96.