Update README.md

Brandon [08-20-17 - 06:05]
Update README.md
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README.md
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 # ZerobraneXmlTagCompletion
 Automatically adds closing tags for HTML/XML
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+Now scans entire document when deciding whether or not to place a closing tag, in addition to the current line.
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+If a second tag is really intended to be placed that is identical to one already present in the file, pressing the '>' key a second time will override the default behavior and place an nth closing tag. It will then delete the extra chevron automatically.
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+Sets of tags still need to be entered one set per line for the script to behave as intended. Trying to do <tag1><tag2></tag2></tag1> is still beyond the scope of this script.