Add missing require.

myronmarston · myronmarston · commit 20fd1e5f5dd3 · 2015-10-13T23:40:59.000-07:00
As of rspec/rspec-support#245, `rspec/support/ruby_features` relies upon `rspec/support` being loaded first.
diff --git a/lib/rspec/core/rake_task.rb b/lib/rspec/core/rake_task.rb
@@ -1,5 +1,6 @@
 require 'rake'
 require 'rake/tasklib'
+require 'rspec/support'
 require 'rspec/support/ruby_features'
 require 'rspec/core/shell_escape'
 
