Breaking Changes from 1.2. to 1.4.
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A description of all changes and features can be found the release
notes (NEWS.org). Breaking changes below:

mu changes:
-----------
* Base path has changed from ~/.mu to ~/.cache/mu. You may want to
  delete the old cache location.
* A new command `mu init` needs to be run once to save the maildir
  location and email adresses in the database.

  mu init --maildir=~/Maildir --my-address=jim@example.com \
                --my-address=bob@example.com

mu4e changes:
-------------
* Variables `mu4e-maildir` and `mu4e-user-mail-address-list`
  are obsolete. The information is taken from the Xapian database now.
  Run `mu init` with the appropiate parameters to create these
  entries.
* Contact sorting is done by `mu` now. As a side effect the following
  variables have been obsoleted:
    - mu4e-contacts-rewrite-function
    - mu4e-compose-complete-ignore-address-regexp
  You can use `mu4e-contact-process-function` instead.