Update dependency lerna to v3.18.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
lerna	devDependencies	patch	3.18.1 -> 3.18.2

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Release Notes

lerna/lerna

### [`v3.18.2`](https://togithub.com/lerna/lerna/blob/master/CHANGELOG.md#​3182httpsgithubcomlernalernacomparev3181v3182-2019-10-21) [Compare Source](https://togithub.com/lerna/lerna/compare/v3.18.1...v3.18.2) ##### Bug Fixes - **version:** Update lockfile version, if present ([5b1b40b](https://togithub.com/lerna/lerna/commit/5b1b40b60ebd442d766236fad19bb6073ccb045b)), closes [#​1998](https://togithub.com/lerna/lerna/issues/1998) [#​2160](https://togithub.com/lerna/lerna/issues/2160) [#​1415](https://togithub.com/lerna/lerna/issues/1415)

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