Bump babel-core from 6.24.0 to 6.26.3
Bump babel-core from 6.24.0 to 6.26.3

Bumps [babel-core](https://github.com/babel/babel) from 6.24.0 to 6.26.3.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v6.24.0...v6.26.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
arunghosh/react-time-line,arunghosh/react-time-line,arunghosh/react-time-line