Update package lock

Prepare for release of v2.3.1 (#937)

* Prepare for release of v2.3.1

* Add ts3.4 to files list in package.json

* Update version numbers and package-lock

Co-authored-by: Justin Fagnani <justinfagnani@google.com>

Prepare 2.3.0 release (#933)

* Prepare 2.3.0 release

* Format

* Fix formatting

Merge pull request #748 from Polymer/release-next

Release 2.2.1

Merge pull request #709 from Polymer/release

Release lit-element 2.2.0

Update Lifecycle doc's broken link to Properties (#602)

2.0.1

2.0.0

2.0.0-rc.5

2.0.0-rc.4