chore(deps): Allow Cypress 3 within peerDep. Updated Cypress and serve deps

[npeterkamps]

Why:

Cypress 3 has been released on 5/29/2018 (changelog).

What:

• Updated peerDependencies to allow Cypress 3
• Updated Cypress within the devDependencies
• Updated serve within the devDependencies
• Changed configs and scripts accordingly.

Checklist:

• Documentation (N/A)
• Tests
• Ready to be merged
• Added myself to contributors table

Locally, I'm having an issue with npm run validate not exiting. Everything passes, but the process doesn't exit. Curious to see if it also happens in Travis.

[npeterkamps]

hmm, should probably wait until #7 is merged and pull master. (I developed this in pr/timeout branch and all tests passed there. Forgot to run everything again in the new branch 😕)

[kentcdodds]

This looks good to me. Once the build is passing let's merge this.

[kentcdodds]

Thanks so much for your help! I've added you as a collaborator on the project. Please make sure that you review the other/MAINTAINING.md and CONTRIBUTING.md files (specifically the bit about the commit messages and the git hooks) and familiarize yourself with the code of conduct (we're using the contributor covenant). You might also want to watch the repo to be notified when someone files an issue/PR. Please continue to make PRs as you feel the need (you can make your branches directly on the repo rather than your fork if you want). Thanks! And welcome to the team :)

[sompylasar]

Why change to shorthand? Has serve stopped supporting full nsmes for options?

[npeterkamps]

You're right, oversight on my part. Long version would be --listen

They did change their API quite drastically. Since it's missing from their docs, here's the help for easy reference.

  serve - Static file serving and directory listing

  USAGE
      $ serve --help
      $ serve --version
      $ serve [-l listen_uri [-l ...]] [directory]

      By default, serve will listen on 0.0.0.0:3000 and serve the
      current working directory on that address.

      Specifying a single --listen argument will overwrite the default, not supplement it.

  OPTIONS
      --help                              Shows this help message
      -v, --version                       Displays the current version of serve
      -l, --listen listen_uri             Specify a URI endpoint on which to listen (see below) -
                                          more than one may be specified to listen in multiple places
      -d, --debug                         Show debugging information
      -s, --single                        Rewrite all not-found requests to `index.html`

  ENDPOINTS
      Listen endpoints (specified by the --listen or -l options above) instruct serve
      to listen on one or more interfaces/ports, UNIX domain sockets, or Windows named pipes.

      For TCP ports on hostname "localhost":
          $ serve -l 1234
      For TCP (traditional host/port) endpoints:
          $ serve -l tcp://hostname:1234
      For UNIX domain socket endpoints:
          $ serve -l unix:/path/to/socket.sock
      For Windows named pipe endpoints:
          $ serve -l pipe:\\.\pipe\PipeName