add versions plugin

versions_plugin_setup.gradle

@@ -0,0 +1,11 @@
+def isNonStable = { String version ->
+    def stableKeyword = ['RELEASE', 'FINAL', 'GA'].any { it -> version.toUpperCase().contains(it) }
+    def regex = /^[0-9,.v-]+(-r)?$/
+    return !stableKeyword && !(version ==~ regex)
+}
+
+tasks.named("dependencyUpdates").configure {
+    rejectVersionIf {
+        isNonStable(it.candidate.version)
+    }
+}