documentation update

Author: Matthew Toledo

README.md

@@ -130,15 +130,15 @@ Here is an excerpt from the Enzyme documentation:
 
 ### mount(node[, options]) => ReactWrapper
 
-####Arguments
+#### Arguments
 
 1. node (ReactElement): The node to render
 2. options (Object [optional]):
 3. options.context: (Object [optional]): Context to be passed into the 4. component
 5. options.attachTo: (DOMElement [optional]): DOM Element to attach the component to.
 6. options.childContextTypes: (Object [optional]): Merged contextTypes for all children of the wrapper.
 
-####Returns
+#### Returns
 - ReactWrapper: The wrapper instance around the rendered output.
 
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