Add 3.4.0 version history

diff --git a/README.md b/README.md
index 9578b4143d742068989590254b7c0746fbdef02b..cde6bd150500e68106ff163d866f1c7dcafe7071 100644 (file)
--- a/README.md
+++ b/README.md
@@ -331,6 +331,10 @@ windGustSpeedNum
 Version history
 ---------------
 
+- 3.4.0 (Mar 2022)
+
+  Implement HN24 for NRCS SNOTEL stations.
+
 - 3.3.1 (Jan 2022)
 
   Fix bug in which HN24 values under certain circumstances could be