Fix typos

Dependencies

• [2] K3HODXGH Check all inputs for blame but only email selected inputs
• [3] N5AS7EKY Include who-broke-the-build information in notification emails
• [4] SRRNCD4W Email responsible authors if requested
• [5] 5EQYVRWE Add a plugin mechanism

Change contents

• replacement in src/lib/Hydra/Plugin/EmailNotification.pm at line 84
  [3.248]→[3.248:286](∅→∅)
  − if (scalar keys %{authors} > 0) {
  [3.248]

  [3.286]
  + if (scalar keys %{$authors} > 0) {
• replacement in src/lib/Hydra/Plugin/EmailNotification.pm at line 86
  [3.357]→[3.357:454](∅→∅)
  − $authorList = join(" or ", scalar @x > 1 ? join(", ", @[0..scalar @x - 2]): (), $x[-1]);
  [3.357]

  [2.683]
  + $authorList = join(" or ", scalar @x > 1 ? join(", ", @x[0..scalar @x - 2]): (), $x[-1]);