Merge branch '4.x-dev'

.gitignore

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-/.idea/
+/.idea/
+/vendor/
+/tests/.phpunit.result.cache
+

CHANGELOG.md

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+# Matomo PHP Tracker Changelog
+
+This is the Developer Changelog for Matomo PHP Tracker. All breaking changes or new features are listed below.
+
+
+## Matomo PHP Tracker 4.0.0
+
+Attention: This version of Matomo PHP Tracker is no longer compatible with Matomo 3.x or earlier
+
+- Support for new page performance metrics (added in Matomo 4) has been added. You can use `setPerformanceTimings()` to set them for page views.
+- Setting page generation time using `setGenerationTime()` has been discontinued. The method still exists to not break applications still using it, but it does not have any effect. Please use new page performance metrics as replacement.
+- Sending requests using cURL will now throw an exception if an error occurs in a request.
+- Matomo does not longer support tracking of these browser plugins: Gears, Director. Therefor the signature of `setPlugins()` changed.
+- Implementation of ecommerce views changed from custom variables to raw parameters