Updated changelog for 2.7.0b1 from Integration_2.7.0

Squashed commit of the following:

commit fb252e6e10
Author: Mahmoud Al-Qudsi <mqudsi@neosmart.net>
Date:   Tue Sep 26 15:52:23 2017 -0500

    CHANGELOG.md: kdeconnect-cli, not kdecomplete

commit e031d91c19
Author: Mahmoud Al-Qudsi <mqudsi@neosmart.net>
Date:   Tue Sep 26 15:49:59 2017 -0500

    fixup! Updated changelog with info about all new and updated completions since 2.6.0

commit 6366a67c21
Author: Mahmoud Al-Qudsi <mqudsi@neosmart.net>
Date:   Tue Sep 26 15:36:37 2017 -0500

    fixup! Updated changelog with info about all new and updated completions since 2.6.0

commit 281be31eb3
Author: Mahmoud Al-Qudsi <mqudsi@neosmart.net>
Date:   Tue Sep 26 15:21:01 2017 -0500

    Updated changelog with info about all new and updated completions since 2.6.0

CHANGELOG.md

@@ -58,10 +58,35 @@ This section is for changes merged to the `major` branch that are not also merge
 - Option completion for `apt list` now works properly (#4350).
 - Added completions for:
   - `as` (#4130)
+  - `cdh` (#2847)
+  - `dhcpd`
+  - `ezjail-admin` (#4324)
+  - `fab` (fabric, #4153)
+  - `grub-file` (#4119)
+  - `grub-install` (#4119)
   - `jest` (#4142)
+  - `kdeconnect-cli`
+  - `magneto` (#4043, #4108)
+  - `mdadm` (#4198)
+  - `s3cmd` (#4332)
   - `sbt` (#4347)
-  - `subl` (Sublime Text 3 editor, #4277)
   - `snap` (#4215)
+  - `subl` (Sublime Text 3 editor, #4277)
+
+- Improved completions for:
+  - `apt`
+  - `cd` (#4061)
+  - `composer` (#4295)
+  - `git` (#4117, #4147, #4329, #4368)
+  - `gphoto2`
+  - `killall` (#4052)
+  - `ln`
+  - `npm` (#4241)
+  - `ssh` (#4377)
+  - `tail`
+  - `xdg-mime` (#4333)
+  - `zypper` (#4325)
+
 
 ---