ChangeLog: typo

* ChangeLog: fix typo, s/Strat/Start/.  [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48773 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
envutil.rb: kill pgroup

* test/lib/envutil.rb (invoke_ruby): kill whole group when :pgroup
  option is set.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48774 b2dd03c8-39d4-4d8f-98ff-823fe69b080e