Small lerna link fix
The link to https://lernajs.io
in code-review.md
is dead, the new link is https://lerna.js.org/
Reference: https://github.com/lerna/lerna/issues/2033#issuecomment-483812533
Changes for !1768 (merged) are carried over (Do I need to drop these changes first?)
Edited by Johnny Yeng