Update min version of reflect-metadata in package.json to latest build

[DonJayamanne]

The latest version of reflect-metadata (npm package) has the fixe related to #432
We need to ensure the extension depends on this new version.

[brettcannon]

So this will solve the inversify problem?

[DonJayamanne]

So this will solve the inversify problem?

Yes

[brettcannon]

I assume this is 0.1.12? (I've told CELA that's the version we are moving to.)