[css-table] fixing up issue with last bullet getting heading format

Author: gregwhitworth

css-tables-3/README.md

@@ -7,14 +7,18 @@ Issue 1.
 * **From:**     Florian Rivoal
 * **Comment:**  https://lists.w3.org/Archives/Public/www-style/2016Jan/0135.html
 * **Open:**     Under Review
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 Issue 2.
 
 * **Summary:**  Rowspanning cells and border-collapse: collapse
 * **From:**     Gérard Talbot
 * **Comment:**  https://lists.w3.org/Archives/Public/www-style/2016Mar/0098.html
 * **Open:**     Under Review
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 Issue 3.
 
 * **Summary:**  Table-row-group can be 0 or more rows