docs: def replace_version_tag(self):
          """find the next major/minor/trivial version number if applicable"""
          version_tag = self.arguments.get('<version>')
          special_keywords = ['current', 'latest']
          if version_tag in special_keywords:
              logger.error("releasing version '{}' is disallowed. Did you mean 'version upload'?".format(version_tag))
              raise SystemExit(1)
          placeholders = dict(major=0, minor=1, trivial=2)
          placeholder = placeholders.get(version_tag)
          if placeholder is None:
              return version_tag
          current_version = self.get_git_describe().lstrip('v')
          version_numbers = current_version.split('-')[0].split('.')
          version_numbers = [int(item) for item in version_numbers]
          version_numbers = version_numbers[:placeholder + 1]
          while len(version_numbers) < 3:
              version_numbers.append(0)
          version_numbers[placeholder] += 1
          return '.'.join([str(item) for item in version_numbers[:2 if placeholder < 2 else 3]])