Update README.md

Made the subsections of the patterns list be more readable on github; the subsection headings were blending into the h1 headings (not differentiated enough); this was done by making them h4 - this is kind of a hack, but it looks good when rendered on githubs webview

Author: Nick Yeates

README.md

@@ -29,12 +29,12 @@ We work together via Github, Webex, Slack, etc. Do not hesitate to join the [#in
 
 # List of Patterns
 
-## Reviewed Patterns (proven and reviewed)
+#### Reviewed Patterns (proven and reviewed)
 
 * [Contracted Contributor](https://github.com/paypal/InnerSourcePatterns/blob/master/contracted-contributor.md)
 * [Dedicated Community Leader](https://github.com/paypal/InnerSourcePatterns/blob/master/dedicated-community-leader.md)
 
-## Pattern Drafts (proven, not yet reviewed)
+#### Pattern Drafts (proven, not yet reviewed)
 
 * [Common Requirements](https://github.com/paypal/InnerSourcePatterns/pull/11)
 * [Reluctance to receive contributions](https://docs.google.com/document/d/13QDN-BpE_BixRFVGjao32n4Ctim0ROXAHbBWMBOijb4/edit)
@@ -46,7 +46,7 @@ We work together via Github, Webex, Slack, etc. Do not hesitate to join the [#in
 * [Open Source trumps InnerSource](https://github.com/paypal/InnerSourceCommons/wiki/Open-Source-trumps-InnerSource)
 * [Overcoming Project Management Time Pressures](https://github.com/paypal/InnerSourceCommons/wiki/Draft-Pattern---Overcoming-Project-Management-Time-Pressures)
 
-## Pattern Ideas (not yet proven; brainstormed)
+#### Pattern Ideas (not yet proven; brainstormed)
 
 * [Badly named piles](https://github.com/paypal/InnerSourcePatterns/blob/master/badly-named-piles.md)
 * [Don't bother looking](https://github.com/paypal/InnerSourcePatterns/blob/master/dont-bother-looking.md)
@@ -56,7 +56,7 @@ We work together via Github, Webex, Slack, etc. Do not hesitate to join the [#in
 * [Change the developers mindset](https://github.com/paypal/InnerSourceCommons/wiki/Pattern:-change-the-developers-mindset)
 * [Share Your Code to Get More Done - Likely Contributors Variant](https://github.com/paypal/InnerSourceCommons/wiki/Pattern:-Share-Your-Code-to-Get-More-Done---Likely-Contributors-Variant)
 
-## Pattern Donuts (needing a solution)
+#### Pattern Donuts (needing a solution)
 
 * [Donut 3: how to defeat the hierarchical constraints](https://github.com/paypal/InnerSourceCommons/wiki/Donut-3%3A-how-to-defeat-the-hierarchical-constraints)
 * [Donut 4: modular code (for reuse) requires extra resources](https://github.com/paypal/InnerSourceCommons/wiki/Donut-4%3A-modular-code-%28for-reuse%29-requires-extra-resources)