Fix pubDate

Author: palemieux

imsc1/spec/ttml-ww-profiles.html

@@ -18,7 +18,7 @@
                 ,   previousMaturity: "PR"
                 /*,   crEnd: "2020-05-05"
                 ,   prEnd: "2020-07-14"*/
-                ,   publishDate: "2020-08-16"
+                ,   publishDate: "2020-08-04"
                 ,   errata: "http://www.w3.org/2020/08/ttml-imsc1.2-errata.html"
                 ,   implementationReportURI: "https://www.w3.org/wiki/TimedText/IMSC1_2_Implementation_Report"
                 ,   sotdAfterWGinfo: "true"