use time tag for publish date

README.md

@@ -86,6 +86,9 @@ There is a markup language which makes writing long blog posts, memex entries, e
 
 // shorthand for level 4 heading
 {.heading text}
+
+// shorthand for publish date (renders as <time class='publish-date'>)
+{+2022-02-22}
 ```
 
 # configuration

main.c

@@ -285,9 +285,9 @@ int fpol(FILE* f, Lexicon* l, char* s) {
 }
 
 int fppublish(FILE* f, char* s) {
-  fputs("<div class='timestamp'>", f);
+  fputs("<time class='publish-date'>", f);
   fputs(s, f);
-  fputs("</div>", f);
+  fputs("</time>", f);
   return 1;
 }