Ruby » Ruby master

logger.rb: fix weekly rotation

• lib/logger.rb (Logger::Period#next_rotate_time): get rid of
  adding to mday not to exceed the days of the month.
  [ruby-core:71185] [Bug #11620]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52293 b2dd03c8-39d4-4d8f-98ff-823fe69b080e