Change cancelled to cancelled?

src/ruby/lib/grpc/generic/active_call.rb

@@ -120,7 +120,7 @@ module GRPC
     end
 
     # cancelled indicates if the call was cancelled
-    def cancelled
+    def cancelled?
       !@call.status.nil? && @call.status.code == Core::StatusCodes::CANCELLED
     end
 
@@ -455,17 +455,17 @@ module GRPC
 
     # SingleReqView limits access to an ActiveCall's methods for use in server
     # handlers that receive just one request.
-    SingleReqView = view_class(:cancelled, :deadline, :metadata,
+    SingleReqView = view_class(:cancelled?, :deadline, :metadata,
                                :output_metadata, :peer, :peer_cert)
 
     # MultiReqView limits access to an ActiveCall's methods for use in
     # server client_streamer handlers.
-    MultiReqView = view_class(:cancelled, :deadline, :each_queued_msg,
+    MultiReqView = view_class(:cancelled?, :deadline, :each_queued_msg,
                               :each_remote_read, :metadata, :output_metadata)
 
     # Operation limits access to an ActiveCall's methods for use as
     # a Operation on the client.
-    Operation = view_class(:cancel, :cancelled, :deadline, :execute,
+    Operation = view_class(:cancel, :cancelled?, :deadline, :execute,
                            :metadata, :status, :start_call, :wait, :write_flag,
                            :write_flag=)
   end

src/ruby/pb/test/client.rb

@@ -369,7 +369,7 @@ class NamedTests
     op.execute
     fail 'Should have raised GRPC:Cancelled'
   rescue GRPC::Cancelled
-    assert("#{__callee__}: call operation should be CANCELLED") { op.cancelled }
+    assert("#{__callee__}: call operation should be CANCELLED") { op.cancelled? }
   end
 
   def cancel_after_first_response
@@ -380,7 +380,7 @@ class NamedTests
     op.execute.each { |r| ppp.queue.push(r) }
     fail 'Should have raised GRPC:Cancelled'
   rescue GRPC::Cancelled
-    assert("#{__callee__}: call operation should be CANCELLED") { op.cancelled }
+    assert("#{__callee__}: call operation should be CANCELLED") { op.cancelled? }
     op.wait
   end
 

src/ruby/spec/generic/active_call_spec.rb

@@ -61,7 +61,7 @@ describe GRPC::ActiveCall do
 
     describe '#multi_req_view' do
       it 'exposes a fixed subset of the ActiveCall methods' do
-        want = %w(cancelled, deadline, each_remote_read, metadata, shutdown)
+        want = %w(cancelled?, deadline, each_remote_read, metadata, shutdown)
         v = @client_call.multi_req_view
         want.each do |w|
           expect(v.methods.include?(w))
@@ -71,7 +71,7 @@ describe GRPC::ActiveCall do
 
     describe '#single_req_view' do
       it 'exposes a fixed subset of the ActiveCall methods' do
-        want = %w(cancelled, deadline, metadata, shutdown)
+        want = %w(cancelled?, deadline, metadata, shutdown)
         v = @client_call.single_req_view
         want.each do |w|
           expect(v.methods.include?(w))