write data to cache file
	parameters:
		cache_path - path to cache file
		content - a data structure to save into cache file

def write(content, filename='cache'):
	""" write data to cache file
	parameters:
		cache_path - path to cache file
		content - a data structure to save into cache file"""
	cache_path = get_cache_path(filename)
	with open(cache_path, 'w') as file:
		if content is not None:
			json.dump(content, file, indent=3, sort_keys=True)