manual: Set version to 0.4.2.
diff --git a/manual/manual.txt b/manual/manual.txt
index 5eb8324..d121b85 100644
--- a/manual/manual.txt
+++ b/manual/manual.txt
@@ -1,6 +1,6 @@
 PulseView User Manual
 =====================
-0.4.1, dated 2018-10-29
+0.4.2, dated 2020-02-29
 :doctype: book
 :imagesdir: ./images
 :sectnums: