Change README to use 2+1 newlines spacing for headers

Author: e1himself

README.md

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-![Tests Status][badge]
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 # Technically Array Container
 
 `Technically\ArrayContainer` is a plain-simple [PSR-11][1] container implementation 
 powered by a simple associative array under the hood.
 
+![Tests Status][badge]
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 ## Features
 
 - PSR-11
@@ -13,6 +14,7 @@ powered by a simple associative array under the hood.
 - Semver
 - Tests
 
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 ## Installation
 
 Use [Composer][2] package manager to add *ArrayContainer* to your project:
@@ -21,6 +23,7 @@ Use [Composer][2] package manager to add *ArrayContainer* to your project:
 composer require technically/array-container
 ```
 
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 ## Example
 
 ```php
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 $logger = $container->get('logger');
 ```
 
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 ## Changelog
 
 All notable changes to this project will be documented in the [CHANGELOG](./CHANGELOG.md) file.