fix publishing version

Author: jenschude

build.gradle

@@ -192,8 +192,8 @@ subprojects { project ->
                 publicDownloadNumbers = true
 
                 version {
-                    name = version
-                    vcsTag = version
+                    name = version.toString()
+                    vcsTag = version.toString()
                     gpg {
                         sign = true
                     }