updated plugin Connect Matomo version 1.1.5

wp-content/plugins/wp-piwik/libs/matomo-php-tracker/README.md

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+# PHP Client for Matomo Analytics Tracking API
+
+The PHP Tracker Client provides all features of the [Matomo Javascript Tracker](https://developer.matomo.org/api-reference/tracking-javascript), such as Ecommerce Tracking, Custom Variables, Event Tracking and more. 
+
+## Documentation and examples 
+Check out our [Matomo-PHP-Tracker developer documentation](https://developer.matomo.org/api-reference/PHP-Piwik-Tracker) and [Matomo Tracking API guide](https://matomo.org/docs/tracking-api/).
+
+
+```php
+// Required variables
+$matomoSiteId = 6;                  // Site ID
+$matomoUrl = "https://example.tld"; // Your matomo URL
+$matomoToken = "";                  // Your authentication token
+
+// Optional variable
+$matomoPageTitle = "";              // The title of the page
+
+// Load object
+require_once("MatomoTracker.php");
+
+// Matomo object
+$matomoTracker = new MatomoTracker((int)$matomoSiteId, $matomoUrl);
+
+// Set authentication token
+$matomoTracker->setTokenAuth($matomoToken);
+
+// Track page view
+$matomoTracker->doTrackPageView($matomoPageTitle);
+```
+
+## Requirements:
+* JSON extension (json_decode, json_encode)
+* cURL or stream extension (to issue the HTTPS request to Matomo)
+
+## Installation
+
+### Composer
+
+```
+composer require matomo/matomo-php-tracker
+``` 
+
+### Manually
+
+Alternatively, you can download the files and require the Matomo tracker manually: 
+
+```
+require_once("MatomoTracker.php");
+```
+
+## License
+
+Released under the [BSD License](https://opensource.org/licenses/BSD-3-Clause)