Update changelog for 66.0.0 release.

Set version to 63.0.8.

Update GeckoView (Beta) to 83.0.20201108174701.

Update GeckoView (Release) to 82.0.20201108180448.

Bug 1600916 - Add version field to task payload for beetmover (taskcl…

…uster)

Update GeckoView (Beta) to 83.0.20201105203649.

Update changelog for 65.0.0 release.

Update GeckoView (Beta) to 83.0.20201103183834.

Update GeckoView (Beta) to 83.0.20201030140015.

Update GeckoView (Beta) to 83.0.20201029182349.