Pull Request #141 Bump puma from 3.9.1 to 4.3.8

Bumps [puma](https://github.com/puma/puma) from 3.9.1 to 4.3.8.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](https://github.com/puma/puma/compare/v3.9.1...v4.3.8)

Signed-off-by: dependabot[bot] <support@github.com>

dependabot[bot] authored GitHub committed

Pull request event #270.1 passed

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Git
travis-ci/travis-foundation:.travis.yml@fa0a37c
language: ruby
rvm: 2.4.2
sudo: false
script: "./ci/buildscript"
env:
  global:
  - NOKOGIRI_USE_SYSTEM_LIBRARIES=true
deploy:
  provider: heroku
  app: travis-foundation-website
  on: master
  api_key: $HEROKU_TOKEN
Build Config
{
  "language": "ruby",
  "os": [
    "linux"
  ],
  "dist": "xenial",
  "rvm": [
    "2.4.2"
  ],
  "sudo": false,
  "script": [
    "./ci/buildscript"
  ],
  "env": {
    "global": [
      {
        "NOKOGIRI_USE_SYSTEM_LIBRARIES": "true"
      }
    ]
  },
  "deploy": [
    {
      "provider": "heroku",
      "strategy": "api",
      "app": "travis-foundation-website",
      "on": {
        "branch": [
          "master"
        ]
      },
      "api_key": "$HEROKU_TOKEN"
    }
  ]
}