Tweaked the bullet list in the README to not be so overly verbose.

README.md

@@ -9,28 +9,18 @@ Willow is a powerful, yet lightweight logging library written in Swift.
 
 - [Features](#features)
 - [Requirements](#requirements)
+- [Migration Guides](#migration-guides)
 - [Communication](#communication)
 - [Installation](#installation)
     - [CocoaPods](#cocoapods)
     - [Carthage](#carthage)
 - [Usage](#usage)
     - [Creating a Logger](#creating-a-logger)
-        - [Logger Configuration](#logger-configuration)
-        - [Thread Safety](#thread-safety)
     - [Logging Messages with Closures](#logging-messages-with-closures)
-        - [Single Line Closures](#single-line-closures)
-        - [Multi-Line Closures](#multi-line-closures)
-        - [Closure Performance](#closure-performance)
     - [Disabling a Logger](#disabling-a-logger)
     - [Synchronous and Asynchronous Logging](#synchronous-and-asynchronous-logging)
-        - [Synchronous Logging](#synchronous-logging)
-        - [Asynchronous Logging](#asynchronous-logging)
     - [Log Message Modifiers](#log-message-modifiers)
-        - [Color Modifiers](#color-modifiers)
-        - [Multiple Modifiers](#multiple-modifiers)
     - [Log Message Writers](#log-message-writers)
-        - [Multiple Writers](#multiple-writers)
-        - [Per LogLevel Writers](#per-loglevel-writers)
 - [Advanced Usage](#advanced-usage)
     - [Creating Custom Log Levels](#creating-custom-log-levels)
     - [Shared Loggers between Frameworks](#shared-loggers-between-frameworks)