update dependencies at 20190821020145

[taichi]

Updating Dependencies

Name	Updating	Latest	devDependencies
ava	0.22.0	2.3.0	*
babel-eslint	8.2.6	10.0.2	*
eslint	4.19.1	6.2.1	*
eslint-config-prettier	2.10.0	6.1.0	*
eslint-plugin-ava	4.5.1	8.0.0	*
eslint-plugin-flowtype	2.50.3	4.2.0	*
eslint-plugin-import	2.14.0...2.18.2	2.18.2	*
eslint-plugin-prettier	2.7.0	3.1.0	*
eslint-plugin-promise	3.8.0	4.2.1	*
flow-bin	0.56.0	0.105.2	*
nyc	11.9.0	14.1.1	*
prettier	1.15.3...1.18.2	1.18.2	*
rimraf	2.6.2...2.7.1	3.0.0	*

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