bump x.y.z version to odd y following creation of RELEASE_3_13 branch

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: infercnv
 Type: Package
 Title: Infer Copy Number Variation from Single-Cell RNA-Seq Data
-Version: 1.8.0
+Version: 1.9.0
 Date: 2019-05-05
 Authors@R: c( person("Timothy", "Tickle", email = "[email protected]", role = "aut"), person("Itay", "Tirosh", email = "[email protected]", role = "aut"), person("Christophe", "Georgescu", email = "[email protected]", role = c("aut", "cre")), person("Maxwell", "Brown", email = "[email protected]", role = "aut"), person("Brian", "Haas", email = "[email protected]", role = "aut")) 
 BugReports: https://github.com/broadinstitute/inferCNV/issues