fix(node): config should use merge, findOneAndUpdate should return new

lodash merge is more in mind with the goal of config's setup. There is an issue with using the state
model's syncing node initially, likely do the original data being returned, which would result in an
error

packages/bitcore-node/src/config.ts

@@ -1,6 +1,7 @@
 import { homedir, cpus } from 'os';
 import parseArgv from './utils/parseArgv';
 import { ConfigType } from './types/Config';
+import * as _ from 'lodash';
 let program = parseArgv([], ['config']);
 
 function findConfig(): ConfigType | undefined {
@@ -76,7 +77,7 @@ const Config = function(): ConfigType {
   };
 
   let foundConfig = findConfig();
-  Object.assign(config, foundConfig, {});
+  config = _.merge(config, foundConfig, {});
   if (!Object.keys(config.chains).length) {
     Object.assign(config.chains, {
       BTC: {

packages/bitcore-node/src/models/state.ts

@@ -20,7 +20,7 @@ export class StateModel extends BaseModel<IState> {
     return this.collection.findOneAndUpdate(
       {},
       { $setOnInsert: { created: new Date()}},
-      { upsert: true }
+      { upsert: true, returnOriginal: false }
     );
   }