Update dependencies in V2 branch, fix compatibility with Node 10

[Volune]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Updated travis.yml to test Node 10

Motivation / Use-Case

webpack-dev-server 2 depends on an older version of spdy which is not compatible with Node 10.
See spdy-http2/handle-thing#5

I updated other dependencies with npm audit fix at the same time, it should fix a few vulnerabilities.

Don't know if you still maintain the v2 branch.

[hiroppy]

Thank you for your contribution.

I don't think we still maintain the v2 branch. /cc @evilebottnawi

[alexander-akait]

@hiroppy some projects like ruby-rails stull use old version, we should fixes only compatibility/security issue when we release v4 we official stop supporting v2 branch, so we can merge this and release as patch

[hiroppy]

Oh, I did not know. OK, I'll review this pr.

[ujenjt]

Hey, we also use v2 branch, so it would be great to have this fixes in next v2 versions.

[alexander-akait]

@ujenjt can you test this PR manually?

[ujenjt]

@ujenjt can you test this PR manually?

Sure. I can test this PR with several projects which use webpack-dev-server v2 and check if it works. What kind of test do you want me to do? Any advice how to test better?

[alexander-akait]

@ujenjt nothing unusual just run and do what you usually do when developing

[ujenjt]

Just tested git://github.com/Volune/webpack-dev-server.git#v2-dependencies version with my webpack config - it works ok for me both with node v10.15.3 and v8.11.3.

[hiroppy]

@ujenjt Thank you for checking this!

[hiroppy]

I confirmed that this works at my local.
BTW, I wonder why Travis doesn't work.

[ujenjt]

Hey, thanks a lot for merging this to v2 branch. When we can expect this has been published to npm?

[alexander-akait]

@ujenjt ~24 hours