Update to the latest version of go-amqp (v0.13.13) (#56)

Update to go-amqp v0.13.13 which has an important fix for multiplexing management requests on an rpc link.

changelog.md

@@ -4,6 +4,7 @@
 - Fixing a potential race condition when an RPC link is shut down while still sending requests
   or handling responses.
   [PR#55](https://github.com/Azure/azure-amqp-common-go/pull/55)
+- Upgrading to go-amqp v0.13.13, which fixes an issue with simultaneous settling on the rpc link.
 
 ## `v3.1.1`
 - Change `Link` so it can handle parallel requests. 

go.mod

@@ -3,7 +3,7 @@ module github.com/Azure/azure-amqp-common-go/v3
 go 1.12
 
 require (
-	github.com/Azure/go-amqp v0.13.11
+	github.com/Azure/go-amqp v0.13.13
 	github.com/Azure/go-autorest/autorest v0.11.18
 	github.com/Azure/go-autorest/autorest/adal v0.9.13
 	github.com/davecgh/go-spew v1.1.1 // indirect

go.sum

@@ -1,7 +1,7 @@
 github.com/Azure/azure-sdk-for-go v51.1.0+incompatible h1:7uk6GWtUqKg6weLv2dbKnzwb0ml1Qn70AdtRccZ543w=
 github.com/Azure/azure-sdk-for-go v51.1.0+incompatible/go.mod h1:9XXNKU+eRnpl9moKnB4QOLf1HestfXbmab5FXxiDBjc=
-github.com/Azure/go-amqp v0.13.11 h1:E28zKoWuzO4+D80iUD88BUorI5PqvIZ/S/77md3hIvA=
-github.com/Azure/go-amqp v0.13.11/go.mod h1:D5ZrjQqB1dyp1A+G73xeL/kNn7D5qHJIIsNNps7YNmk=
+github.com/Azure/go-amqp v0.13.13 h1:OBPwCO50EzniOyZR0M4VbGJYDxceIy3SFOnKVMJktdY=
+github.com/Azure/go-amqp v0.13.13/go.mod h1:D5ZrjQqB1dyp1A+G73xeL/kNn7D5qHJIIsNNps7YNmk=
 github.com/Azure/go-autorest v14.2.0+incompatible h1:V5VMDjClD3GiElqLWO7mz2MxNAK/vTfRHdAubSIPRgs=
 github.com/Azure/go-autorest v14.2.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
 github.com/Azure/go-autorest/autorest v0.11.18 h1:90Y4srNYrwOtAgVo3ndrQkTYn6kf1Eg/AjTFJ8Is2aM=