updated README specimen image

README.md

@@ -1,6 +1,7 @@
-<img src="img/hack-header-1_3.png" alt="Hack-a monospaced sans-serif font for source code" width="728">
 
-## Hack: a monospaced sans-serif font for source code
+# Hack: a monospaced typeface designed for source code
+
+<img src="img/hack-specimen.png" alt="Hack-a monospaced sans-serif font for source code" width="728">
 
 ### About