update version in reademe

fahchen · fahchen · commit 4677e0dbe518 · 2020-05-02T00:17:18.000+08:00
diff --git a/README.md b/README.md
@@ -13,7 +13,7 @@ Add `hierarch` to your list of dependencies in `mix.exs`:
 ```elixir
 def deps do
   [
-    {:hierarch, "~> 0.2.0"}
+    {:hierarch, "~> 0.2.1"}
   ]
 end
 ```

Original file line number	Diff line number	Diff line change
@@ -13,7 +13,7 @@ Add `hierarch` to your list of dependencies in `mix.exs`:
`13`	`13`	```elixir
`14`	`14`	`def deps do`
`15`	`15`	`[`
`16`		`- {:hierarch, "~> 0.2.0"}`
	`16`	`+ {:hierarch, "~> 0.2.1"}`
`17`	`17`	`]`
`18`	`18`	`end`
`19`	`19`	```