js: Add js.PullSubscribe and sub.Fetch APIs for pull consumers

Signed-off-by: Waldemar Quevedo <wally@synadia.com>

go.mod

@@ -4,8 +4,8 @@ go 1.15
 
 require (
 	github.com/golang/protobuf v1.4.2
-	github.com/nats-io/nats-server/v2 v2.1.8-0.20210227190344-51550e242af8
-	github.com/nats-io/nkeys v0.2.0
+	github.com/nats-io/nats-server/v2 v2.2.1-0.20210317155042-716c6d60b593
+	github.com/nats-io/nkeys v0.3.0
 	github.com/nats-io/nuid v1.0.1
 	google.golang.org/protobuf v1.23.0
 )

go.sum

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