Typofixes

src/api/index.js

@@ -124,6 +124,7 @@ class Steem extends EventEmitter {
     call(method, params, callback) {
         if (this._transportType !== 'http') {
             callback(new Error('RPC methods can only be called when using http transport'));
+            return
         }
         const id = ++this.seqNo;
         jsonRpcCall(this.options.uri, {method, params, id})

src/api/transports/http.js

@@ -17,7 +17,7 @@ class RPCError extends Error {
 
 export function jsonRpcCall(uri, {method, id, params}) {
   const payload = {id, jsonrpc: '2.0', method, params};
-  fetch(uri, {
+  return fetch(uri, {
     body: JSON.stringify(payload),
     headers: {'User-Agent': 'steem-js/1'},
     method: 'post',