update release notes

Author: cowtowncoder

release-notes/CREDITS-2.x

@@ -42,3 +42,8 @@ Georg Schmidt-Dumont (georgschmidtdumont@github)
 
 * Reported #74: MrBean module should not materialize `java.io.Serializable`
  (2.9.9)
+
+Harrison Houghton (hrhino@github)
+
+* Suggested, contributed impl for #52: Interfaces may have non-abstract methods (since java8)
+ (2.10.0)

release-notes/VERSION-2.x

@@ -13,6 +13,7 @@ Modules:
 2.10.0 (not yet released)
 
 #52: (mrbean) Interfaces may have non-abstract methods (since java8)
+ (suggested by Harrison H)
 #79: (all) Add simple module-info for JDK9+, using Moditect
 - Update `asm` version 5.2 -> 7.0 for JDK 11 support
 - Remove SPI metadata for OSGi module as there is no 0-arg constructor, does