Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/3eefee4560de
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #14994 from gaye/disable-calendar-today

Bug 956064 - Calendar today item marionette orange

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https://hg.mozilla.org/integration/gaia-central/rev/c1dede75338b
Author: Gareth Aye <gaye@mozilla.com>
Desc: Bug 956064 - Calendar today item marionette orange

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "8986094d6206c10b73e09249e876ccf7280290ae", 
+    "revision": "3eefee4560de11f34d8cc647fd1ace8e2e35e02d", 
     "repo_path": "/integration/gaia-central"
 }