bump x.y.z version to odd y following creation of RELEASE_3_19 branch

Author: jwokaty

DESCRIPTION

@@ -1,7 +1,7 @@
 Type: Package
 Package: tidySummarizedExperiment
 Title: Brings SummarizedExperiment to the Tidyverse 
-Version: 1.14.0
+Version: 1.15.0
 Authors@R: c(person("Stefano", "Mangiola", email = "mangiolastefano@gmail.com",
                   role = c("aut", "cre")) )
 Description: The tidySummarizedExperiment package provides a set of tools for creating and