Add changelogs

Author: joguSD

.changes/next-release/bugfix-CommandHistory-52041.json

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+{
+  "type": "bugfix",
+  "category": "Command History",
+  "description": "Ensure aws prefix is not prepended twice in command history. Fixes `#157 <https://github.com/awslabs/aws-shell/issues/157>`__"
+}

.changes/next-release/bugfix-Keybinding-59162.json

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+{
+  "type": "bugfix",
+  "category": "Keybinding",
+  "description": "Switching between emacs/vi keybindings now functions properly"
+}

.changes/next-release/enhancement-Documentation-157.json

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+{
+  "type": "enhancement",
+  "category": "Documentation",
+  "description": "The documentation pane can now be focused and navigated. Fixes `#74 <https://github.com/awslabs/aws-shell/issues/74>`__, `#159 <https://github.com/awslabs/aws-shell/issues/159>`__"
+}