2.1.1:
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 * Update DSGVO legal stuff

2.1.0:
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 * Trying to recap some extension and improvements which we had before
 * [NOTE: No masking of IP addresses is required in Google Analytics 4, as IP addresses are neither logged nor stored.]

2.0.0:
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 * Upgrade the plugin to support GA4 and drop support to any obsoleted Google APIs

1.8:
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 * Fix an uninitialized variable check

1.7:
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 * Fix and improve markup_element check for consistency

1.6:
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 * Secure authors target _blank link by living standard rel="noopener"

1.5:
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 * Silence possible eventData property check

1.4.0 (fishnix):
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# add enhanced link attribution option
# changed link to kleinerChemiker's github since the blog seems gone

1.3.0:
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# added tracking for Google AdSense
# memo for myself: correct version number scheme: major release number -> plugin rewrite, minor release number -> new feature, patch level -> bug fix

1.2.4:
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# added _anonymizeIp()

1.2.3:
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# Bug with external link and downloads fixed

1.2.2:
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# added ChangeLog
# added check if account number is valid
# updated to new GA asynchronous tracking code