fix (#120): remove a compiler warning

Author: zookzook

CHANGELOG.md

@@ -5,13 +5,19 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## 0.8.1 (2021-01-22) 
+#120
+
+## 0.8.2 (2022-02-03)
+* Enhancements
+  * Remove a compiler warning (thanks for a-jimenez )
+
+[## 0.8.1 (2022-01-22) 
 * Enhancements
   * Fix for serializing BSON Regex without options (thanks to MillionIntegrals)
   * Misc doc changes (thanks to kianmeng)
   * Added support for OP_MSG exhaustAllowed flag
   * Added support for streaming protocol 
-  * Added Insights app for development 
+  * Added Insights app for development ]()
 
 ## 0.8.0 (2021-11-07) (0.7.5 was not published)
 * Enhancements

lib/mongo/mongo_db_connection.ex

@@ -196,9 +196,6 @@ defmodule Mongo.MongoDBConnection do
 
   @impl true
   def checkout(state), do: {:ok, state}
-  @impl true
-  def checkin(state), do: {:ok, state}
-
   @impl true
   def handle_begin(_opts, state), do: {:ok, nil, state}
   @impl true