update dependencies at 20180516020205

[taichi]

Updating Dependencies

Name	Updating	Latest	devDependencies
ava	0.22.0	0.25.0	*
babel-core	6.26.0...6.26.3	6.26.3	*
babel-preset-env	1.6.1...1.7.0	1.7.0	*
cross-env	5.1.4...5.1.5	5.1.5	*
flow-bin	0.56.0	0.72.0	*
npm-run-all	4.1.2...4.1.3	4.1.3	*
nyc	11.7.1...11.8.0	11.8.0	*

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