correct indentation for block with multiple matches

[tonini]

fixes #227

This PR refines the indentation for block of matches.

case parse do
  { [ help: true ], _, _ }
    -> :help
  { _, [ user, project, count ], _ } ->
    { user, project, count }
  { _, [ user, project ], _ } -> { user, project, @default_count }
  _ -> :help
end

case parse do
  { [ help: true ], _, _ }
    -> :help
  { _, [ user, project, count ], _ }
    -> { user, project, count }
  { _, [ user, project ], _ }
    -> { user, project, @default_count }
  _ -> :help
  asd -> asda
  asdasd ->
    asd
  asd ->
    asd
    asd
  asdasd -> asdad
  asdasd ->
    asdasd
  { [ help: true ], _, _ }
    -> :help
  { _, [ user, project, count ], _ }
    -> { user, project, count }
  { _, [ user, project ], _ }
    -> { user, project, @default_count }
  _ -> :help
  { _, [ user, project ], _ } -> { user, project, @default_count }
  { _, [ _, project ], _ } -> { _, project, @default_count }
end