Refactor read-write transaction to show the detailed aborted error me…

…ssage. (#84)

go.mod

@@ -3,16 +3,16 @@ module github.com/cloudspannerecosystem/spanner-cli
 go 1.13
 
 require (
-	cloud.google.com/go v0.56.0
-	cloud.google.com/go/spanner v1.5.1
+	cloud.google.com/go v0.63.0
+	cloud.google.com/go/spanner v1.9.0
 	github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e
-	github.com/google/go-cmp v0.5.0
+	github.com/google/go-cmp v0.5.1
 	github.com/jessevdk/go-flags v1.4.0
 	github.com/mattn/go-runewidth v0.0.8 // indirect
 	github.com/olekukonko/tablewriter v0.0.4
 	github.com/xlab/treeprint v1.0.1-0.20200715141336-10e0bc383e01
-	google.golang.org/api v0.21.0
-	google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013
-	google.golang.org/grpc v1.28.1
+	google.golang.org/api v0.30.0
+	google.golang.org/genproto v0.0.0-20200815001618-f69a88009b70
+	google.golang.org/grpc v1.31.0
 	google.golang.org/protobuf v1.25.0
 )