Red 3.4.0 - Changelog (#4059)

* Add 3.4.0 changelog

* Fix some stuff in previous changelog

- Remove empty section
- Fix alphabetical order in contributor list
- Add missing Flame to contributor list
- Fix the length of rst header underline

* PR 4050

* PR 3993

* PR 4064 (issue 4028)

* PR 4077

* PR 3956

* PR 4079

* PR 4089 (issue 4088)

Co-Authored-By: Dav <dav@mail.stopdavabuse.de>

* PR 4099

* PR 4097

* Add Trusty to contributor list

* PR 4116

* PR 4043 (issue 3945)

* PR 4072

* PR 4109

* PR 4110

* PR 4102

* PR 4112

* PR 4161

* PR 4121

* PR 4134, 4143

* PR 4085

* PR 2982 (issue 2906)

* PR 3679 (issue 3605)

* PR 4148 (issue 4147)

* PR 4011

* PR 4022 (issue 4013)

* PR 4135 (issue 4122)

* PR 4167

* PR 4141

* Add NeuroAssassin to contributor list

* PR 4129

* PR 4149

* PR 4105, 4127 (issue 4106)

* PR 3845

* PR 4142

* PR 4163

* PR 4176

* PR 4172 (issue 4066)

* PR 4038 (issue 3786)

* PR 3081

* PR 4137 (issue 4118)

* PR 4017

* PR 4182

Co-Authored-By: Dav <dav@mail.stopdavabuse.de>

* Add Kowlin to contributor list

* PR 4182

* PR 4169

* PR 3084

* Add `douglas-cpp`, `MeatyChunks`, `zephyrkul` to contributor list

* PR 4138

* Add some anchor

* Add release date

Co-authored-by: Dav <dav@mail.stopdavabuse.de>
Co-authored-by: palmtree5 <3577255+palmtree5@users.noreply.github.com>

docs/changelog_3_3_0.rst

@@ -4,7 +4,7 @@ Redbot 3.3.11 (2020-08-10)
 ==========================
 
 | Thanks to all these amazing people that contributed to this release:
-| :ghuser:`douglas-cpp`, :ghuser:`Drapersniper`, :ghuser:`jack1142`, :ghuser:`MeatyChunks`, :ghuser:`Vexed01`, :ghuser:`yamikaitou`
+| :ghuser:`douglas-cpp`, :ghuser:`Drapersniper`, :ghuser:`Flame`, :ghuser:`jack1142`, :ghuser:`MeatyChunks`, :ghuser:`Vexed01`, :ghuser:`yamikaitou`
 
 End-user changelog
 ------------------
@@ -43,10 +43,10 @@ Warnings
 
 
 Redbot 3.3.10 (2020-07-09)
-===================================
+==========================
 
 | Thanks to all these amazing people that contributed to this release:
-| :ghuser:`aikaterna`, :ghuser:`bobloy`, :ghuser:`Dav-Git`, :ghuser:`Drapersniper`, :ghuser:`Flame442`, :ghuser:`flaree`, :ghuser:`jack1142`, :ghuser:`MiniJennJenn`, :ghuser:`NeuroAssassin`, :ghuser:`thisisjvgrace`, :ghuser:`Vexed01`, :ghuser:`Injabie3`, :ghuser:`mikeshardmind`
+| :ghuser:`aikaterna`, :ghuser:`bobloy`, :ghuser:`Dav-Git`, :ghuser:`Drapersniper`, :ghuser:`Flame442`, :ghuser:`flaree`, :ghuser:`Injabie3`, :ghuser:`jack1142`, :ghuser:`mikeshardmind`, :ghuser:`MiniJennJenn`, :ghuser:`NeuroAssassin`, :ghuser:`thisisjvgrace`, :ghuser:`Vexed01`
 
 End-user changelog
 ------------------
@@ -127,11 +127,6 @@ Developer changelog
 - Vendor the ``discord.ext.menus`` module (:issue:`4039`)
 
 
-Documentation changes
----------------------
-
-
-
 Miscellaneous
 -------------
 
@@ -145,6 +140,7 @@ Miscellaneous
 - Fixed commands being translated where they should not be (:issue:`3938`, :issue:`3919`)
 - Fixed grammar errors and added full stopts in ``core_commands.py`` (:issue:`4023`)
 
+
 Redbot 3.3.9 (2020-06-12)
 =========================