3.0.0

CHANGES:

• The caqti library now holds the Caqti 3 API and caqti.classic
  contains a Caqti 2 compatibility wrapper. Users of the Caqti 2 API must
  now add caqti.classic to their link lines. Early adopters of the
  Caqti 3 API must replace caqti.template with caqti and adjust some
  module paths. Switching to the new API is recommended, but may be done
  incrementally for existing applications.

• Fixed initial comma when formatting rows, affecting
  Caqti_type.pp_value (Caqti 2) and Caqti.Template.Row.pp (Caqti 3).

• Put on hold deprecation of the caqti-dynload package due to
  issue #140.

• Foreign key constraints are now enabled for SQLite by default.