Update grade plugin and kotlin ver. (#534)

Author: hotchemi

gradle.properties

@@ -14,8 +14,8 @@ VCS_URL                 = https://github.com/hotchemi/PermissionsDispatcher.git
 LICENCES                = ['Apache-2.0']
 
 # Plugin versions
-GRADLE_PLUGIN_VERSION   = 3.2.0-beta01
-KOTLIN_VERSION          = 1.2.50
+GRADLE_PLUGIN_VERSION   = 3.2.1
+KOTLIN_VERSION          = 1.2.71
 CONFIG_PLUGIN_VERSION   = 2.2.2
 JFROG_PLUGIN_VERSION    = 4.1.1
 BINTRAY_PLUGIN_VERSION  = 1.8.4