v1.4.0

• feature: install message and update message in configuration:

module.exports = {
  software: {
    node: '*',
    yarn: '~1.17.3',
    nginx: {
      semver: '>= 1.16.x',
      optional: true, // optional (won't fail)
      installMessage: '<install instruction>', // custom message when binary is not found
      updateMessage: '<update instruction>', // custom message when binary has wrong version
    },
    httpd: {
      semver: '^1.x',
      flag: '-v', // custom version flag
    },
  },
};