Fix themeChanged
closure strong reference cycles
#87
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Learn more about, see https://learnappmaking.com/how-to-fix-strong-reference-cycle-swift/
Refer https://github.com/cntrump/HighlightrObjC/blob/844e3d44ed80e71da6cac5b240184d99528fddaa/Highlightr/Highlightr/CodeAttributedString.m