repo: bump launcher version to 2.0
repo: bump launcher version to 2.0

This reflects the transition to the new 2.x series which will be
migrating to Python 3-only.

Bug: https://crbug.com/gerrit/10418
Change-Id: I6355ac955d26b930f8a3721d3526eec5bed92400
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/253132
Reviewed-by: David Pursehouse <e7b5c6a4a3dbaca972851f8c075e19915752593f@collab.net>
Tested-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@google.com>

mer-tools/git-repo,TheQtCompany/git-repo,aosp-mirror/tools_repo,lipro-yocto/git-repo,lewixliu/git-repo,GerritCodeReview/git-repo,TheQtCompany/git-repo,couchbasedeps/git-repo,mer-tools/git-repo,couchbasedeps/git-repo,lipro-yocto/git-repo,codetutil/git-repo,aosp-mirror/tools_repo,GerritCodeReview/git-repo,lewixliu/git-repo,codetutil/git-repo