Tweak wording in README

README.md

@@ -14,7 +14,7 @@ Although the new code has been written with the intention of not breaking demo c
 
 Note that this feature list is relative to [Woof!'s](https://github.com/fabiangreffrath/woof/blob/master/README.md#key-features);
 read the latter for more details.
-Some features were first introduced in Nugget Doom and later merged into Woof!, and so they're not listed here anymore.
+Some features were first implemented in Nugget Doom and later in Woof!, and so they're not listed here anymore.
 
 Most of Nugget Doom's features come from other sources, like source ports and mods;
 the initial implementations for some are **ported from (p.f.)** said sources, while others are just **inspired by (i.b.)** them.