code: def update(self,updates={}):
  		
  		try:
  			csp = self.read()
  		except:
  			csp = {'default-src':"'self'"}
  			self.write(csp)
  		csp.update(updates)
  		self.write(csp)
docs: update csp_default.json with dict
  			
  			if file empty add default-src and create dict