commit ec542f140b5e0d86ad6954476f9ed2d018f47e72 (HEAD, tag: v1.21.1, origin/v1.21.x, origin/HEAD, v1.21.x)
Author:     Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
AuthorDate: 2017-04-09
Commit:     Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
CommitDate: 2017-04-09

    Update manual pages

commit 39a2a2437c76a23539a44abb1bb328396b6d2f6f
Author:     Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
AuthorDate: 2017-04-09
Commit:     Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
CommitDate: 2017-04-09

    Bump up version number to 1.21.1

commit a073dfc633827cec6aa4b2e7b059ba316d81c5b7
Author:     Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
AuthorDate: 2017-04-07
Commit:     Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
CommitDate: 2017-04-09

    nghttpx: Fix bug that 204 from h1 backend is always treated as error

commit d2ba169f792143eaf85b90f403beb84b3b8d354e
Author:     Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
AuthorDate: 2017-03-31
Commit:     Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
CommitDate: 2017-04-09

    asio: Fix crash if connect takes longer time than ping interval

commit a629a0c6770dda93f6507d5a6648df2b717569c2
Author:     Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
AuthorDate: 2017-03-31
Commit:     Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
CommitDate: 2017-04-09

    asio: Fix compile error
