bump x.y.z version to even y prior to creation of RELEASE_3_21 branch

Author: jwokaty

DESCRIPTION

@@ -2,7 +2,7 @@ Package: mzR
 Type: Package
 Title: parser for netCDF, mzXML and mzML and mzIdentML files
        (mass spectrometry data)
-Version: 2.41.4
+Version: 2.42.0
 Author: Bernd Fischer, Steffen Neumann, Laurent Gatto, Qiang Kou, Johannes Rainer
 Authors@R: c(
     person("Steffen", "Neumann", email="[email protected]", role=c("aut","cre")),