Bump version to 0.0.16

Overview of changes:

 *  Added head() method to get first N messages in sequence

 *  Updated URLs after migrating to GitLab.com

 *  Enabled Gladness pipeline

 *  Minor packaging cleanup

mkit.ini

@@ -1,5 +1,5 @@
 [project]
-    version     = 0.0.15
+    version     = 0.0.16
     name        = imapdomo
     pkgname     = imapdomo
     maintainer  = Alois Mahdal <netvor+imapdomo@vornet.cz>