old_contents: 
  module.exports = {
    config: {
      /* no version support yet
      runtime: {
        type: String,
        enum: ['2.6', '2.7', '3.3', 'whatever']
      },
      */
      test: {
        type: String,
        enum: ['none', 'gradle build'],
        default: 'gradle build'
      },
      prepare: {
        type: String,
        default: 'gradle install'
      }
    }
  }
  
new_contents: 
  module.exports = {
    config: {
      /* no version support yet
      runtime: {
        type: String,
        enum: ['7', '8', '9', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', 'whatever']
      },
      */
      test: {
        type: String,
        enum: ['none', 'gradle build'],
        default: 'gradle build'
      },
      prepare: {
        type: String,
        default: 'gradle install'
      }
    }
  }
  
subject: add version tags; but version is still not supported