Reflect successful testing against WordPress 5.7.2 #11
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This PR is to reflect successful testing of civievent-widget version 3.2 against WordPress version 5.7.2.
Fixes #10.
I found and addressed one PHP notice appearing in the debug log, "Only variables should be passed by reference."
Beyond that, I:
(There were WordPress code standards issues but I would consider those to be beyond the scope of this testing update.)