Update dependency webpack-dev-server to ^3.7.1

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
webpack-dev-server	devDependencies	minor	^3.7.1	source
@types/webpack-dev-server	devDependencies	patch	3.1.6	source

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Release Notes

webpack/webpack-dev-server

v3.7.1

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v3.7.0

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Bug Fixes

• change clientLogLevel order to be called first (#​1973) (57c8c92)
• es6 syntax in client (#​1982) (802aa30)

v3.6.0

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Bug Fixes

• change clientLogLevel order to be called first (#​1973) (57c8c92)
• es6 syntax in client (#​1982) (802aa30)

v3.5.1

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Bug Fixes

• config: enable --overlay (#​1968) (dc81e23)
• server: don't ignore node_modules by default (#​1970) (699f8b4), closes #​1794

Features

• server: add serverMode option (#​1937) (44a8cde)

3.5.1 (2019-06-01)

Bug Fixes

• allow passing promise function of webpack.config.js (#​1947) (8cf1053)

v3.5.0

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Bug Fixes

• add client code for electron-renderer target (#​1935) (9297988)
• add client code for node-webkit target (#​1942) (c6b2b1f)

Features

• server: onListening option (#​1930) (61d0cdf)
• server: add callback support for invalidate (#​1900) (cd218ef)
• server: add WEBPACK_DEV_SERVER env variable (#​1929) (856169e)

3.4.1 (2019-05-17)

Bug Fixes

• add none and warning to clientLogLevel (#​1901) (0ae9be8)
• broken hot reload (#​1903) (6a444cd)

v3.4.1

Compare Source

Bug Fixes

• add client code for electron-renderer target (#​1935) (9297988)
• add client code for node-webkit target (#​1942) (c6b2b1f)

Features

• server: onListening option (#​1930) (61d0cdf)
• server: add callback support for invalidate (#​1900) (cd218ef)
• server: add WEBPACK_DEV_SERVER env variable (#​1929) (856169e)

3.4.1 (2019-05-17)

Bug Fixes

• add none and warning to clientLogLevel (#​1901) (0ae9be8)
• broken hot reload (#​1903) (6a444cd)

v3.4.0

Compare Source

Bug Fixes

• don't use self.location.port (#​1838) (6d31984)
• do not include config files in dist (#​1883) (c535bb2)
• only add client entry to web targets (#​1775) (cf4d0d0)
• update clientLogLevel to match docs and error (#​1825) (7f52bbf)
• add errors-warnings preset (#​1895) (2a81ad2)

Features

• added injectClient option (#​1775) (cf4d0d0)
• added injectHot option (#​1775) (cf4d0d0)
• added sockPort option (#​1792) (58d1682)
• added sockHost option (#​1858) (f47dff2)
• support HEAD method (#​1875) (c2360e4)
• added liveReload option (#​1889) (fc4fe32)
• update express to 4.17 version

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