[libgee] Fix missing 'since' doc for Future and Promise

[Maciej Marcin Piechotka <mpiechotka src gnome org>]

commit a9f95265facc931222b7bd53531efcd71db75880
Author: Maciej Piechotka <uzytkownik2 gmail com>
Date:   Sat Jul 6 19:54:27 2013 +0200

    Fix missing 'since' doc for Future and Promise

 gee/future.vala  |    1 +
 gee/promise.vala |    4 ++++
 gee/task.vala    |    2 ++
 3 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/gee/future.vala b/gee/future.vala
index 841f085..a08450a 100644
--- a/gee/future.vala
+++ b/gee/future.vala
@@ -32,6 +32,7 @@ using GLib;
  * @see Lazy
  * @see task
  * @see async_task
+ * @since 0.11.0
  *
  * Note: Statement that call does not block does not mean that it is lock-free.
  *   Internally the implementation is allowed to take mutex but it should guarantee
diff --git a/gee/promise.vala b/gee/promise.vala
index 806e7d8..61e5754 100644
--- a/gee/promise.vala
+++ b/gee/promise.vala
@@ -28,6 +28,10 @@ using GLib;
  *
  * Typically the producer will create promise and return { link future} while
  * keeping the promise to itself. Then when value is ready it can call { link set_value}.
+ *
+ * @see Future
+ * @see task
+ * @since 0.11.0
  */
 public class Gee.Promise<G> {
        /**
diff --git a/gee/task.vala b/gee/task.vala
index bbcd769..6a55afc 100644
--- a/gee/task.vala
+++ b/gee/task.vala
@@ -30,6 +30,7 @@ namespace Gee {
         * @params task Task to be executed
         * @returns Future value returned by task
         * @see async_task
+        * @since 0.11.0
         *
         * Note: There is limited number of threads unless environment variable
         *   ``GEE_NUM_THREADS`` is set to -1. It is not adviced to call I/O or
@@ -50,6 +51,7 @@ namespace Gee {
         * one of threads from pool will execute the task.
         *
         * @see task
+        * @since 0.11.0
         *
         * Note: There is limited number of threads unless environment variable
         *   ``GEE_NUM_THREADS`` is set to -1. It is not adviced to call I/O or