Updated ruby protos to use new _pb filename
diff --git a/src/ruby/bin/math_server.rb b/src/ruby/bin/math_server.rb
index 1ee4c56..751a6eb 100755
--- a/src/ruby/bin/math_server.rb
+++ b/src/ruby/bin/math_server.rb
@@ -42,7 +42,7 @@
 require 'forwardable'
 require 'grpc'
 require 'logger'
-require 'math_services'
+require 'math_services_pb'
 require 'optparse'
 
 # RubyLogger defines a logger for gRPC based on the standard ruby logger.