[gnome-continuous] Use 2.0 branch for libical

[Emmanuele Bassi <ebassi src gnome org>]

commit 7a3cded6ea539b52614bcb3d28c05da1fd946d6e
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Oct 4 10:18:40 2017 +0100

    Use 2.0 branch for libical
    
    The master branch is for 3.0, and it's not API stable yet.

 manifest.json |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/manifest.json b/manifest.json
index fbc2a05..f9f9b2f 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1003,6 +1003,7 @@
                {"src": "gnome:gnome-online-miners"},
 
                {"src": "libical:libical",
+                 "branch": "2.0",
                 "patches": ["libical-cmake-buildapi.patch"]},
 
                {"src": "gnome:evolution-data-server",