changed release name to 1.5.3

OpenBoard.pro

@@ -11,7 +11,7 @@ CONFIG += debug_and_release \
 VERSION_MAJ = 1
 VERSION_MIN = 5
 VERSION_PATCH = 3
-VERSION_TYPE = rc # a = alpha, b = beta, rc = release candidate, r = release, other => error
+VERSION_TYPE = r # a = alpha, b = beta, rc = release candidate, r = release, other => error
 VERSION_BUILD = 0
 
 VERSION = "$${VERSION_MAJ}.$${VERSION_MIN}.$${VERSION_PATCH}-$${VERSION_TYPE}.$${VERSION_BUILD}"