Description/Steps to reproduce

Currently, a LoopBack4 app created by the CLI tool will not compile correctly due to compatibility issue with @types/lodash and TypeScript.

Fix

• lock @loopback/build typescript version to 2.6

Side note

• the package needs to be published; lb-mocha command in build current doesn't exist
• there should be a way to essentially do an acceptance test of physically creating an app through CLI and then trying out npm t and npm start and making sure that they don't fail.

Comments

• this is tracked by [lodash] Type 'T' does not satisfy the constraint 'object'. DefinitelyTyped/DefinitelyTyped#23375