Fix typo and update release date in changelog

Signed-off-by: Fred Bricon <fbricon@gmail.com>

Revert redhat-developer#942 - Enable proposed API

The VS Code Marketplace prevents extensions from publishing with
enableProposedApi:true:

    ERROR  Extensions using proposed API (enableProposedApi: true) can't be published to the Marketplace

Signed-off-by: Fred Bricon <fbricon@gmail.com>

Forgot to upversion to 0.45.0

Signed-off-by: Fred Bricon <fbricon@gmail.com>

Changelog for the 0.44.0 release

Signed-off-by: Fred Bricon <fbricon@gmail.com>

Update changelog for the 0.43.0 release

Signed-off-by: Fred Bricon <fbricon@gmail.com>

Upversion to 0.42.1

Signed-off-by: Fred Bricon <fbricon@gmail.com>

Prevent Theia from crashing by checking if extensions.onDidChange exists

Signed-off-by: Fred Bricon <fbricon@gmail.com>

Changelog got the 0.41.0 release

Signed-off-by: Fred Bricon <fbricon@gmail.com>

Changelog for 0.40.0

Signed-off-by: Fred Bricon <fbricon@gmail.com>

Changelog for 0.39.0 release

Signed-off-by: Fred Bricon <fbricon@gmail.com>