[whatwg/xhr] Getting an warning "Synchronous XMLHttpRequest on the main thread is deprecated" (#135)

Hi

Using: xhr.open( 'GET', url, false );

Getting the following debugger error (warning actually):

"external.js:54 Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience"

Any help appreciated. Using it in conjunction with reveal.js for slide shows.
Cheers

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