Apply some previously ignored flake8 rules
pytorch-lightning/setup.cfg
    
    
        Lines 84 to 87
      in
      ae14fca
    
  
  
    

        
          
           # TODO: delete these next 3 because we no longer use black 
        

        
          
           E203  # whitespace before ':'. Opposite convention enforced by black 
        

        
          
           E231  # missing whitespace after ',', ';', or ':'; for black 
        

        
          
           W503  # line break before binary operator, need for black 
        
    
  


Each of these should be removed and format fixed in separate PRs
Context: #5739
Tracker:

 E203
 E231
 W504: Just remove, should not need formatting changes

Contributors are welcome 🤗