Release 4.3.3

[phil-davis]

Note: this release removes an ancient (1992) and "never used" timezone that has been deprecated upstream for ages and has now been removed upstream in the "standard" timezone database, and in PHP's list of known timezones. There really should be absolutely nobody using it. So I am making this just a patch release because it fixes this for people who are updating to the latest PHP 7.*.* patch releases, and the "backward-compatibility break" is so minor.

[codecov]

Codecov Report

Merging #522 (8e34e2e) into master (0b443d6) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #522   +/-   ##
=========================================
  Coverage     98.67%   98.67%           
  Complexity     1776     1776           
=========================================
  Files            66       66           
  Lines          4304     4304           
=========================================
  Hits           4247     4247           
  Misses           57       57           

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[phil-davis]

CI passed: https://travis-ci.org/github/sabre-io/vobject/builds/742349040
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