Log Message:
security/ruby-bcrypt: update to 3.1.13

Update ruby-bcrypt to 3.1.13.
pkgsrc change: correct HOMEPAGE.

3.1.13 May 31 2019

  - No longer include compiled binaries for Windows. See GH #173.
  - Update C and Java implementations to latest versions [GH #182 by @fonica]
  - Bump default cost to 12 [GH #181 by @bdewater]
  - Remove explicit support for Rubies 1.8 and 1.9
  - Define SKIP_GNU token when building extension (Fixes FreeBSD >= 12)
    [GH #189 by @adam12]