add README.md

tmornini · Dec 13, 2017 · 63ed9c3 · 63ed9c3
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@@ -149,6 +149,10 @@ for 128+ bit UUIDs.
 ⧆optional-name⧆:iso8601:µs:z⧆ is a matcher for ISO 8601 format timestamps
 with microsecond resolution and zulu (Z) timezone.
 
+## Built-in Substitutes
+
+    ⧈YYYY-MM-DD⧈ is a substitute for today's date
+
 ## Delayed Requests
 
 If you need to delay between one request (and it's associated response) and the next,