[ruby/irb] Version 1.3.1

https://github.com/ruby/irb/commit/c230d08911

lib/irb/version.rb

@@ -11,7 +11,7 @@
 #
 
 module IRB # :nodoc:
-  VERSION = "1.3.0"
+  VERSION = "1.3.1"
   @RELEASE_VERSION = VERSION
-  @LAST_UPDATE_DATE = "2020-12-25"
+  @LAST_UPDATE_DATE = "2021-01-12"
 end