Update README

README.md

@@ -4,6 +4,7 @@
 [![License](https://poser.pugx.org/sop/aes-kw/license)](https://github.com/sop/aes-kw/blob/master/LICENSE)
 
 # AES Key Wrap
+
 A PHP library for AES Key Wrap
 ([RFC 3394](https://tools.ietf.org/html/rfc3394))
 algorithm with padding
@@ -13,15 +14,18 @@ support.
 Supports AES key sizes of 128, 192 and 256 bits.
 
 ## Installation
+
 This library is available on
 [Packagist](https://packagist.org/packages/sop/aes-kw).
 
     composer require sop/aes-kw
 
 ## Code examples
+
 Here are some simple usage examples. Namespaces are omitted for brevity.
 
 ### Wrap a 128 bit key with AES-128
+
 Wrap a key of 16 bytes using a 16-byte key encryption key.
 
 ```php
@@ -37,6 +41,7 @@ Outputs:
     89efdbc3501f1f5e952a4bbae1329c9f1a47b9fd61b48dee
 
 ### Unwrap a key
+
 Unwrap a key from previous example. `$kek` and `$algo` variables are the same.
 `$ciphertext` variable contains the output from a wrapping procedure.
 
@@ -50,6 +55,7 @@ Outputs:
     MySecretPassword
 
 ### Wrap an arbitrary length passphrase with AES-192
+
 Wrapping a key that is not a multiple of 64 bits requires padding.
 
 ```php
@@ -65,6 +71,7 @@ Outputs:
     f319811450badfe4385b5534bf26fa6f9fdcd1a593b3ae6b707f15c1015bbf3faf58619818bd8784
 
 ### Unwrap a key with padding
+
 Key that was wrapped with padding must be unwrapped with `unwrapPad`.
 
 ```php
@@ -77,4 +84,5 @@ Outputs:
     My hovercraft is full of eels.
 
 ## License
+
 This project is licensed under the MIT License.