Update README.md

Fix header levels

evennia/contrib/base_systems/components/README.md

@@ -2,23 +2,23 @@
 
 _Contrib by ChrisLR 2021_
 
-# The Components Contrib
+## The Components Contrib
 
 This contrib introduces Components and Composition to Evennia.
 Each 'Component' class represents a feature that will be 'enabled' on a typeclass instance.
 You can register these components on an entire typeclass or a single object at runtime.
 It supports both persisted attributes and in-memory attributes by using Evennia's AttributeHandler.
 
-# Pros
+## Pros
 - You can reuse a feature across multiple typeclasses without inheritance
 - You can cleanly organize each feature into a self-contained class.
 - You can check if your object supports a feature without checking its instance.
 
-# Cons
+## Cons
 - It introduces additional complexity.
 - A host typeclass instance is required.
 
-# How to install
+## How to install
 
 To enable component support for a typeclass,
 import and inherit the ComponentHolderMixin, similar to this
@@ -126,7 +126,7 @@ from typeclasses.components import health
 ```
 Both of the above examples will work.
 
-# Full Example
+## Full Example
 ```python
 from evennia.contrib.base_systems import components