Fix getPosition

* Re adds the v1 endpoint as `getPositions`
* Fixes params for v2 endpoint `getPosition`

Resolves: #5

doc/rest-client.md

@@ -52,9 +52,13 @@ If you only use the [public endpoints](#public-endpoints) you can ommit key and
 #### async changeUserLeverage(params)
 [See bybit documentation](https://github.com/bybit-exchange/bybit-official-api-docs/blob/master/en/rest_api.md#-change-user-leverage)
 
-#### async getPosition()
+#### async getPosition(params)
 [See bybit documentation](https://github.com/bybit-exchange/bybit-official-api-docs/blob/master/en/rest_api.md#-my-position-v2)
 
+#### async getPositions()
+*Deprecated v1 method*
+[See bybit documentation](https://github.com/bybit-exchange/bybit-official-api-docs/blob/master/en/rest_api.md#positionlistget)
+
 #### async changePositionMargin(params)
 [See bybit documentation](https://github.com/bybit-exchange/bybit-official-api-docs/blob/master/en/rest_api.md#-change-position-margin)
 

lib/rest-client.js

@@ -109,8 +109,15 @@ module.exports = class RestClient {
     return await this.request.post('/user/leverage/save', params);
   }
 
-  async getPosition() {
+  async getPosition(params) {
-    return await this.request.get('/v2/private/position/list');
+    assert(params, 'No params passed');
+    assert(params.symbol, 'Parameter symbol is required');
+
+    return await this.request.get('/v2/private/position/list', params);
+  }
+
+  async getPositions() {
+    return await this.request.get('/position/list');
   }
 
   async changePositionMargin(params) {