chore(deps): update dependency webpack-defaults to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
webpack-defaults	devDependencies	major	^2.3.0 -> ^3.0.0	source

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Release Notes

webpack-contrib/webpack-defaults

v3.0.0

Compare Source

Bug Fixes

• typo in security command (scripts) (#​148) (7df6f45)
• ignore IntelliJ IDEA files (*.iml) (#​146) (565c814)
• husky hooks setup (#​142) (cd50463)
• switch from webpack-defaults to [@webpack-contrib](https://renovatebot.com/gh/webpack-contrib)/defaults (#​147) (29a7013)
• bin field problem (91f54d2)
• remove commitlint from templates (f96786f)

Features

• new pull request template (#​140) (4fcadf5)
• update deps and required configuration

BREAKING CHANGE

• switch to babel@7

2.6.0 (2018-09-05)

Bug Fixes

• use schema-utils instead @webpack-contrib/schema-utils to validate options (#​128) (63644e1)
• skip canary tests on appveyor when it is not required (f97c678)
• correct link in README on CONTRIBUTING.md and LICENSE (3307b05)

Features

• add issues templates (bug, docs, feature, modification, support) (9a97478)
• add npm size badge to README (a094e1f)
• add and use node@10 for appveyor and CircleCI (f97c678)
• use npm audit instead nsp (42e14e3)
• use npm ci where it is possible (42e14e3)
• enable cache for appveyor

Internal

• remove codecov config file, default configuration is enough (9f4f9fc
• simplify CircleCI config (42e14e3)

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