Require ActiveSupport at the top of our rakefile.

Sam Phippen · Sam Phippen · commit db0d380b1bee · 2016-04-01T15:18:36.000-04:00
Because of this trace: https://travis-ci.org/rspec/rspec-rails/jobs/120133080#L5065-L5080
diff --git a/Rakefile b/Rakefile
@@ -1,3 +1,4 @@
+require "active_support/all"
 require "bundler"
 begin
   Bundler.setup
