Bump Khepri to version 0.2.1

Author: dumbbell

README.md

@@ -38,15 +38,15 @@ Using Rebar:
 
 ```erlang
 %% In rebar.config
-{deps, [{khepri, "0.2.0"}]}.
+{deps, [{khepri, "0.2.1"}]}.
 ```
 
 Using Erlang.mk:
 
 ```make
 # In your Makefile
 DEPS += khepri
-dep_khepri = hex 0.2.0
+dep_khepri = hex 0.2.1
 ```
 
 Using Mix:
@@ -55,7 +55,7 @@ Using Mix:
 # In mix.exs
 defp deps do
   [
-    {:khepri, "0.2.0"}
+    {:khepri, "0.2.1"}
   ]
 end
 ```

doc/overview.edoc

@@ -3,7 +3,7 @@
 @author The RabbitMQ team <[email protected]>
 @copyright 2021-2022 VMware, Inc. or its affiliates.  All rights reserved.
 @title The Khepri Database
-@version Development branch
+@version 0.2.1
 
 @doc
 Khepri is a tree-like replicated on-disk database library for Erlang and

mix.exs

@@ -5,7 +5,7 @@ defmodule Khepri.MixProject do
     [
       app: :khepri,
       description: "Tree-like replicated on-disk database library",
-      version: "0.2.0",
+      version: "0.2.1",
       language: :erlang,
       deps: deps()
     ]

src/khepri.app.src

@@ -6,7 +6,7 @@
   %%   * mix.exs
   %%   * doc/overview.edoc
   %% Pay attention to links in particular.
-  {vsn, "0.2.0"},
+  {vsn, "0.2.1"},
   {registered, []},
   {applications,
    [kernel,