Update CHANGELOG for v1.8.3 (PowerShell#1483)

* Update CHANGELOG for v1.8.3

* Use conventional CHANGELOG format

* Fix typo

* Add PSES changes

prep for 1.8.2 release (PowerShell#1454)

* prep for 1.8.2 release

* set to 1.8.2 because version of vsix is calc by package.json

* update Docker image build version

* updated deps

* fix versions

* vscode requires mocha ^4.0.1 for some reason

Update CHANGELOG and version numbers for 1.8.1 release (PowerShell#1426)

Fix merge typo

Update version number in package.json

prep for 1.6.0 release (PowerShell#1206)

Merge pull request PowerShell#1099 from PowerShell/rkeithhill/prep-re…

…lease

Prep for 1.5.1 release

Bump version to 1.5.0, update CHANGELOG.md

Bump version to 1.4.3, update CHANGELOG.md

Bump version to 1.4.2, update CHANGELOG.md