fix(deps): update dependency react-transition-group to v2.7.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
react-transition-group	devDependencies	minor	2.5.3 -> 2.7.0	source

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Release Notes

reactjs/react-transition-group

### [`v2.7.0`](https://togithub.com/reactjs/react-transition-group/blob/master/CHANGELOG.md#​270httpsgithubcomreactjsreact-transition-groupcomparev261v270-2019-03-22) [Compare Source](https://togithub.com/reactjs/react-transition-group/compare/v2.6.1...v2.7.0) ##### Features - support ESM (tree-shaking) ([#​455](https://togithub.com/reactjs/react-transition-group/issues/455)) ([ef3e357](https://togithub.com/reactjs/react-transition-group/commit/ef3e357)) #### [2.6.1](https://togithub.com/reactjs/react-transition-group/compare/v2.6.0...v2.6.1) (2019-03-14) ##### Bug Fixes - **Transition:** make `exit` key optional when passing an object to the `timeout` prop ([#​464](https://togithub.com/reactjs/react-transition-group/pull/464)) ([3a4cf9c](https://togithub.com/reactjs/react-transition-group/commit/3a4cf9c91ab5f25caaa9501b129bce66ec9bb56b)) - **package.json:** mark react-transition-group as side-effect free for webpack tree shaking ([#​472](https://togithub.com/reactjs/react-transition-group/issues/472)) ([b81dc89](https://togithub.com/reactjs/react-transition-group/commit/b81dc89)) ### [`v2.6.1`](https://togithub.com/reactjs/react-transition-group/blob/master/CHANGELOG.md#​270httpsgithubcomreactjsreact-transition-groupcomparev261v270-2019-03-22) [Compare Source](https://togithub.com/reactjs/react-transition-group/compare/v2.6.0...v2.6.1) ##### Features - support ESM (tree-shaking) ([#​455](https://togithub.com/reactjs/react-transition-group/issues/455)) ([ef3e357](https://togithub.com/reactjs/react-transition-group/commit/ef3e357)) #### [2.6.1](https://togithub.com/reactjs/react-transition-group/compare/v2.6.0...v2.6.1) (2019-03-14) ##### Bug Fixes - **Transition:** make `exit` key optional when passing an object to the `timeout` prop ([#​464](https://togithub.com/reactjs/react-transition-group/pull/464)) ([3a4cf9c](https://togithub.com/reactjs/react-transition-group/commit/3a4cf9c91ab5f25caaa9501b129bce66ec9bb56b)) - **package.json:** mark react-transition-group as side-effect free for webpack tree shaking ([#​472](https://togithub.com/reactjs/react-transition-group/issues/472)) ([b81dc89](https://togithub.com/reactjs/react-transition-group/commit/b81dc89)) ### [`v2.6.0`](https://togithub.com/reactjs/react-transition-group/blob/master/CHANGELOG.md#​260httpsgithubcomreactjsreact-transition-groupcomparev253v260-2019-02-26) [Compare Source](https://togithub.com/reactjs/react-transition-group/compare/v2.5.3...v2.6.0) ##### Features - add appear timeout ([#​462](https://togithub.com/reactjs/react-transition-group/issues/462)) ([52cdc34](https://togithub.com/reactjs/react-transition-group/commit/52cdc34)) #### [2.5.3](https://togithub.com/reactjs/react-transition-group/compare/v2.5.2...v2.5.3) (2019-01-14) ##### Bug Fixes - strip custom prop-types in production ([#​448](https://togithub.com/reactjs/react-transition-group/issues/448)) ([46fa20f](https://togithub.com/reactjs/react-transition-group/commit/46fa20f)) #### [2.5.2](https://togithub.com/reactjs/react-transition-group/compare/v2.5.1...v2.5.2) (2018-12-20) ##### Bug Fixes - pass appear to CSSTransition callbacks ([#​441](https://togithub.com/reactjs/react-transition-group/issues/441)) ([df7adb4](https://togithub.com/reactjs/react-transition-group/commit/df7adb4)), closes [#​143](https://togithub.com/reactjs/react-transition-group/issues/143) #### [2.5.1](https://togithub.com/reactjs/react-transition-group/compare/v2.5.0...v2.5.1) (2018-12-10) ##### Bug Fixes - prevent calling setState in TransitionGroup if it has been unmounted ([#​435](https://togithub.com/reactjs/react-transition-group/issues/435)) ([6d46b69](https://togithub.com/reactjs/react-transition-group/commit/6d46b69))

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