Include edge Rails in the build matrix

Highlighting an incompatibility with the new implementation of
`[ActiveSupport::OrderedOptions#dig]`.

[^1]: https://github.com/rails/rails/commit/5c15b586aab85fc4fa1465499fc9a97a446f4d52

gemfiles/rails_edge.gemfile

@@ -0,0 +1,9 @@
+source 'https://rubygems.org'
+git_source(:github) { |repo| "https://github.com/#{repo}.git" }
+
+git "https://github.com/rails/rails.git" do
+  gem "railties"
+  gem "activesupport"
+end
+
+gemspec path: "../"