tools: Add go vet as a linter (#1421)

* tools: add go vet

* tools: Add go vet as a linter

client/tx/broadcast.go

@@ -9,7 +9,7 @@ import (
 
 // Tx Broadcast Body
 type BroadcastTxBody struct {
-	TxBytes string `json="tx"`
+	TxBytes string `json:"tx"`
 }
 
 // BroadcastTx REST Handler

client/tx/sign.go

@@ -11,9 +11,9 @@ import (
 // REST request body
 // TODO does this need to be exposed?
 type SignTxBody struct {
-	Name     string `json="name"`
-	Password string `json="password"`
-	TxBytes  string `json="tx"`
+	Name     string `json:"name"`
+	Password string `json:"password"`
+	TxBytes  string `json:"tx"`
 }
 
 // sign transaction REST Handler