Update to 0.5.4

KlausBlum · web-flow · commit 202b88f86ede · 2017-04-11T13:08:10.000+02:00
diff --git a/Release Notes.txt b/Release Notes.txt
@@ -1,5 +1,5 @@
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-OOoLilyPond 0.5.3 Release Notes  (March 2017)
+OOoLilyPond 0.5.4 Release Notes  (April 2017)
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