function vm(inputVersion = '') {

  let [ major, minor, patch ] = inputVersion.split('.');
  let currentVersion = {
      major: major && parseInt(major, 10) || 0,
      minor: minor && parseInt(minor, 10) || 0,
      patch: patch && parseInt(patch, 10) || 1,
    };
  let previousVersion = null;

  this.release = () => {
    return `${currentVersion.major}.${currentVersion.minor}.${currentVersion.patch}`;
  }

  this.major = () => {
    previousVersion = { ...currentVersion };
    currentVersion.major += 1;
    currentVersion.minor = 0;
    currentVersion.patch = 0;
    return this;
  }

  this.minor = () => {
    previousVersion = { ...currentVersion };
    currentVersion.minor += 1;
    currentVersion.patch = 0;
    return this;
  }

  this.patch = () => {
    previousVersion = { ...currentVersion };
    currentVersion.patch += 1;
    return this;
  }

  this.rollback = () => {
    if (!Boolean(previousVersion)){
      throw new Error('Can`t rollback.')
    }
    currentVersion = { ...previousVersion };
    return this;
  }
  return this;
}