old_contents: import tcxparser
  tcx = tcxparser.TCXParser('gps_logs/2017-06-15_Running.tcx')
  print(tcx.duration)
  
new_contents: import tcxparser
  from darksky import forecast
  from configparser import ConfigParser
  
  # Darksky weather API.
  # Create config file manually
  parser = ConfigParser()
  parser.read('slowburn.config', encoding='utf-8')
  darksky_key = parser.get('darksky', 'key')
  
  tcx = tcxparser.TCXParser('gps_logs/2017-06-15_Running.tcx')
  
  print(tcx.duration)
  boston = forecast(darksky_key, 42.3601, -71.0589)
  print(boston)
  
subject: Add sample Darksky API call