Update default gems list at 572eebf [ci skip]

Author: matzbot

NEWS.md

@@ -110,7 +110,7 @@ The following default gems are updated.
 * stringio 3.1.2.dev
 * strscan 3.1.1.dev
 * syntax_suggest 2.0.2
-* tempfile 0.3.0
+* tempfile 0.3.1
 * time 0.4.1
 * timeout 0.4.2
 * tmpdir 0.3.0