PROTON-2442, PROTON-2506: set version for 0.37.0-rc2

This reverts commit 10519f500baf03d4653aaea58a888b8857576657.
diff --git a/VERSION.txt b/VERSION.txt
index 3ba6348..0f1a7df 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-0.38.0-SNAPSHOT
+0.37.0