Change README to use 2+1 newlines spacing for headers

Author: e1himself

README.md

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 # Technically Dependency Resolver
 
 `Technically\DependencyResolver` is a simple yet powerful tool to instantiate classes
 autowiring their dependencies by resolving them from a [PSR-11][1] container 
 or recursively instantiating them with *DependencyResolver* itself.
 
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 ## Features
 
 - Based on PSR-11
@@ -15,6 +16,7 @@ or recursively instantiating them with *DependencyResolver* itself.
 - Semver
 - Tests
 
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 ## Installation
 
 Use [Composer][2] package manager to add *Technically\DependencyResolver* to your project:
@@ -23,6 +25,7 @@ Use [Composer][2] package manager to add *Technically\DependencyResolver* to you
 composer require technically/dependency-resolver
 ```
 
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 ## Example
 
 ```php
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 ```
 
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 ## Changelog
 
 All notable changes to this project will be documented in the [CHANGELOG](./CHANGELOG.md) file.