add missing require 'rspec'

pitr-ch · pitr-ch · commit efd8379da411 · 2018-07-10T23:32:07.000+02:00
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
@@ -21,6 +21,7 @@
 
 require 'concurrent'
 require 'concurrent-edge'
+require 'rspec'
 
 Concurrent.use_simple_logger Logger::FATAL
 
