add issetequal to manual

fredrikekre · fredrikekre · commit 6f29861e74cf · 2018-05-15T16:09:53.000+02:00
diff --git a/doc/src/base/collections.md b/doc/src/base/collections.md
@@ -242,6 +242,7 @@ Base.intersect!
 Base.issubset
 Base.:⊈
 Base.:⊊
+Base.issetequal
 ```
 
 Fully implemented by:
