update docs/ws2

Author: JacobPlaster

docs/ws2.md

@@ -14,6 +14,7 @@ Communicates with v2 of the Bitfinex WebSocket API
     * [._validateMessageSeq(msg)](#WSv2+_validateMessageSeq) ⇒ <code>Error</code>
     * [._verifyManagedOBChecksum(symbol, prec, cs)](#WSv2+_verifyManagedOBChecksum) ⇒ <code>Error</code>
     * [.getOB(symbol)](#WSv2+getOB) ⇒ <code>OrderBook</code>
+    * [.getLosslessOB(symbol)](#WSv2+getLosslessOB) ⇒ <code>OrderBook</code>
     * [.getCandles(key)](#WSv2+getCandles) ⇒ <code>Array</code>
     * [.managedSubscribe(channel, identifier, payload)](#WSv2+managedSubscribe) ⇒ <code>boolean</code>
     * [.managedUnsubscribe(channel, identifier)](#WSv2+managedUnsubscribe) ⇒ <code>boolean</code>
@@ -196,6 +197,21 @@ Set `manageOrderBooks: true` in the constructor to use.
 | --- | --- |
 | symbol | <code>string</code> | 
 
+<a name="WSv2+getLosslessOB"></a>
+
+### wSv2.getLosslessOB(symbol) ⇒ <code>OrderBook</code>
+Returns an up-to-date lossless copy of the order book for the specified symbol, or
+null if no OB is managed for that symbol. All amounts and prices are in original
+string format.
+Set `manageOrderBooks: true` in the constructor to use.
+
+**Kind**: instance method of [<code>WSv2</code>](#WSv2)  
+**Returns**: <code>OrderBook</code> - ob - null if not found  
+
+| Param | Type |
+| --- | --- |
+| symbol | <code>string</code> | 
+
 <a name="WSv2+getCandles"></a>
 
 ### wSv2.getCandles(key) ⇒ <code>Array</code>
@@ -660,6 +676,7 @@ received.
 | --- | --- | --- |
 | opts | <code>Object</code> |  |
 | opts.pair | <code>string</code> |  |
+| opts.symbol | <code>string</code> |  |
 | opts.cbGID | <code>string</code> | callback group id |
 | cb | <code>Method</code> |  |