docs: Add closeButtonHtml to list of options that can be React elemen…

…ts (#122)
sweetalert2 · Sep 2, 2020 · 824a1b5 · 824a1b5
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diff --git a/README.md b/README.md
@@ -17,6 +17,7 @@ The following options can be React elements:
  - confirmButtonText
  - cancelButtonText
  - footer
+ - closeButtonHtml
 
 ## Installation