Update bundled gems list at d485638 [ci skip]

Author: matzbot

NEWS.md

@@ -36,7 +36,7 @@ The following bundled gems are promoted from default gems.
 * rdoc 6.13.1
 * win32ole 1.9.1
 * irb 1.15.2
-* reline 0.6.0
+* reline 0.6.1
 * readline 0.0.4
 * fiddle 1.1.6
 
@@ -66,6 +66,7 @@ The following bundled gems are added.
 The following bundled gems are updated.
 
 * minitest 5.25.5
+* test-unit 3.6.8
 * rexml 3.4.1
 * net-imap 0.5.6
 * net-smtp 0.5.1