[ruby-cvs:73440] samuel:r66339 (trunk): Add NEWS about coroutine implementation.

[samuel at ruby-lang.org]

samuel	2018-12-12 08:49:29 +0900 (Wed, 12 Dec 2018)

  New Revision: 66339

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=66339

  Log:
    Add NEWS about coroutine implementation.

  Modified files:
    trunk/NEWS