Update dependency lerna to v3.13.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
lerna	devDependencies	patch	3.13.1 -> 3.13.4	source

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Release Notes

lerna/lerna

### [`v3.13.4`](https://togithub.com/lerna/lerna/blob/master/CHANGELOG.md#​3134httpsgithubcomlernalernacomparev3133v3134-2019-04-24) [Compare Source](https://togithub.com/lerna/lerna/compare/v3.13.3...v3.13.4) ##### Bug Fixes - **import:** Avoid "unrecognized input" error from colors when using `--flatten` ([#​2037](https://togithub.com/lerna/lerna/issues/2037)) ([51625fa](https://togithub.com/lerna/lerna/commit/51625fa)), closes [#​1644](https://togithub.com/lerna/lerna/issues/1644) - **version:** Resolve prerelease for version without bump ([#​2041](https://togithub.com/lerna/lerna/issues/2041)) ([aa11325](https://togithub.com/lerna/lerna/commit/aa11325)) - **version:** Search for complete tag prefix when composing GitHub releases ([024a6ab](https://togithub.com/lerna/lerna/commit/024a6ab)), closes [#​2038](https://togithub.com/lerna/lerna/issues/2038) ### [`v3.13.3`](https://togithub.com/lerna/lerna/blob/master/CHANGELOG.md#​3134httpsgithubcomlernalernacomparev3133v3134-2019-04-24) [Compare Source](https://togithub.com/lerna/lerna/compare/v3.13.2...v3.13.3) ##### Bug Fixes - **import:** Avoid "unrecognized input" error from colors when using `--flatten` ([#​2037](https://togithub.com/lerna/lerna/issues/2037)) ([51625fa](https://togithub.com/lerna/lerna/commit/51625fa)), closes [#​1644](https://togithub.com/lerna/lerna/issues/1644) - **version:** Resolve prerelease for version without bump ([#​2041](https://togithub.com/lerna/lerna/issues/2041)) ([aa11325](https://togithub.com/lerna/lerna/commit/aa11325)) - **version:** Search for complete tag prefix when composing GitHub releases ([024a6ab](https://togithub.com/lerna/lerna/commit/024a6ab)), closes [#​2038](https://togithub.com/lerna/lerna/issues/2038) ### [`v3.13.2`](https://togithub.com/lerna/lerna/blob/master/CHANGELOG.md#​3133httpsgithubcomlernalernacomparev3132v3133-2019-04-17) [Compare Source](https://togithub.com/lerna/lerna/compare/v3.13.1...v3.13.2) ##### Bug Fixes - **child-process:** Centralize `exitCode` translation from string codes into numbers ([09c0103](https://togithub.com/lerna/lerna/commit/09c0103)), closes [#​2031](https://togithub.com/lerna/lerna/issues/2031) - **docs:** Add missing docs for `--tag-version-prefix` ([#​2035](https://togithub.com/lerna/lerna/issues/2035)) ([ff9c476](https://togithub.com/lerna/lerna/commit/ff9c476)), closes [#​1924](https://togithub.com/lerna/lerna/issues/1924) - **exec:** Handle node string error codes before setting process.exitCode ([#​2031](https://togithub.com/lerna/lerna/issues/2031)) ([c599c64](https://togithub.com/lerna/lerna/commit/c599c64))

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