Grammar fixes (en)

stomar · stomar · commit 0d29a3f33cd3 · 2016-06-20T17:48:14.000+02:00
diff --git a/en/news/_posts/2016-06-20-ruby-2-4-0-preview1-released.md b/en/news/_posts/2016-06-20-ruby-2-4-0-preview1-released.md
@@ -51,7 +51,7 @@ a back reference object and changing `$~` to reduce object allocation.
 
 ### [Thread#report_on_exception and Thread.report_on_exception](https://bugs.ruby-lang.org/issues/6647)
 
-Ruby ignored exceptions in threads unless another thread explicitly joins it.
+Ruby ignores exceptions in threads unless another thread explicitly joins them.
 With `report_on_exception = true`,
 you can notice if a thread has died due to an unhandled exception.
 
