Rename docs to doc [ci skip]
Add CHANGELOG.md and changelog generator [ci skip]
Remove unneeded ruby header files
Temporarily test against all 2.1.x versions
2-1-head is not available on travis
Add an example for the instance name suggestion [ci skip]
Use #drop instead of a bit less readable [1..-1]
Do not test against old 2.1.x Rubies on Travis
Remove unneeded files
Update ruby header files for 2.2.0dev
Remove duplicate ruby header files

 * 2.1.2 uses the same header files as 2.1.1
 * same for 2.1.4 and 2.1.5
Force to upgrade this gem to get it working with new Ruby versions

To avoid introducing a bug like https://github.com/yuki24/did_you_mean/issues/14,
did_you_mean shouldn't be able to compile without the latest ruby header
files if a new Ruby version is released.
Better integration with better_errors
Automatically load BetterErrors extension if on Rails
Add support for multiple versions of better_errors

And this integration only works with MRI 2.0.0 and higher.