Update default gems list at 4655b17 [ci skip]

Author: matzbot

NEWS.md

@@ -254,7 +254,7 @@ The following default gems are updated.
 * resolv 0.6.3
 * stringio 3.1.9.dev
 * strscan 3.1.6.dev
-* timeout 0.4.4
+* timeout 0.5.0
 * uri 1.1.1
 * weakref 0.1.4
 * zlib 3.2.2