update readme for 0.4.0 release

aaronpk · aaronpk · commit 42ef6eb9777b · 2018-03-13T16:33:15.000-07:00
diff --git a/README.md b/README.md
@@ -342,7 +342,7 @@ Currently php-mf2 passes the majority of it’s own test case, and a good percen
 
 ### Changelog
 
-#### Current Master Branch
+#### v0.4.0
 
 Breaking changes:
 
