readme: add note about first request taking longer and why (#42)

pilwon · Nov 25, 2020 · 97501dc · 97501dc
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diff --git a/README.md b/README.md
@@ -23,6 +23,9 @@ Regarding the package API:
 
 * `quote()` - NEW API more faithful to Yahoo's new API.  See below.  This replaces `snapshot()` and we suggest you use it instead.
 
+* Note: your very first request will take a bit longer to return, as we need to
+first send an additional request to Yahoo to get a "crumb" that is used for
+all future quests.
 
 ## Installation