Updated readme header

Author: Hultner

README.md

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-# python-dataclasses-meetup
-Notes for my Python Dataclasses presentation
+
+<p align="center">
+  <a href="http://cetrez.com/"><img src="./res/cetrez.svg" alt="Hack the Castle" align="center" width="400"></a>
+</p>
+<p align="center">
+	<a href="http://cetrez.com/" rel="nofollow" class="rich-diff-level-one">Cetrez</a> | <a href="http://blog.cetrez.com/" rel="nofollow" class="rich-diff-level-one">Blog</a> | <a href="http://slides.com/hultner/python-dataclasses-gothpy-alexander-hultner/fullscreen" rel="nofollow" class="rich-diff-level-one">Presentation slides</a> | <a href="https://www.facebook.com/groups/nordiskpython/" rel="nofollow" class="rich-diff-level-one">Nordisk Python Community</a> | <a href="https://www.meetup.com/GothPy/events/249499024/" rel="nofollow" class="rich-diff-level-one">Meetup event</a> | <a href="https://twitter.com/ahultner" rel="nofollow" class="rich-diff-level-one">@ahultner</a>
+</p>
+
+# ♜ Python Dataclasses 
+**By Alexander Hultnér** at GothPy 17th of May 2018.
+
 
 ## Dataclasses 
 Python 3.6+ for ordered dicts and type annotation support