while parsing a block mapping
  in "<string>", line 2, column 5:
        flake8:
        ^
expected <block end>, but found '<block mapping start>'
  in "<string>", line 5, column 6:
         csslint:
         ^

while parsing a block mapping
  in "<string>", line 2, column 5:
        flake8:
        ^
expected <block end>, but found '<block mapping start>'
  in "<string>", line 6, column 6:
         csslint:
         ^