Bump version to 5.5.

[DanielRosenwasser]

Note that this breaks all the deprecations from 5.0. Unfortunately, I cannot look into that.

[typescript-bot]

Looks like you're introducing a change to the public API surface area. If this includes breaking changes, please document them on our wiki's API Breaking Changes page.

Also, please make sure @DanielRosenwasser and @RyanCavanaugh are aware of the changes, just as a heads up.

[fatcerberus]

@DanielRosenwasser Apparently it’s very important that you be made aware of the changes made by… yourself

[DanielRosenwasser]

I don't feel like making the bot smarter...

I do like being reminded how important the bot thinks I am though!

[DanielRosenwasser]

@sheetalkamat last commit edits a test to permit errors. The test is for project references that use --prepend.

[ghiscoding]

nice!!! I assume that a build size comparison will be made available when the v5.5 release blog post comes out!? Removing ES3 is long overdue 😄

[jakebailey]

Those are all test changes; the removal of ES3 is not likely to reduce the size of the package too much.

[ghiscoding]

oh ok thanks for the info @jakebailey