old_contents: import os
  import json
  
  SCHEMA_FILE = os.path.join(os.path.dirname(__file__), 'vega-lite-schema.json')
  
  with open(SCHEMA_FILE) as f:
      SCHEMA = json.load(f)
  
new_contents: import os
  import json
  
  SCHEMA_FILE = os.path.join(os.path.abspath(os.path.dirname(__file__)),
                             'vega-lite-schema.json')
  
  with open(SCHEMA_FILE) as f:
      SCHEMA = json.load(f)
  
subject: make SCHEMA_PATH absolute