docs: function (increment) {
          increment = increment || Semver.PATCH; // default is patch
          switch (increment) {
              /* jshint indent: false */
              case Semver.MAJOR:
                  this.major++;
                  this.minor = this.patch = 0;
                  break;
              case Semver.MINOR:
                  this.minor++;
                  this.patch = 0;
                  break;
              case Semver.PATCH:
                  this.patch++;
                  break;
          }
          return this;
      }