Fix for CakePHP 3.5.x

[markholt]

I've popped in a change for the latest version of CakePHP - 3.5.x. to remove the strict warnings.

[stickler-ci]

Your stickler.yml configuration file could not be parsed. We got the following error:

while parsing a block mapping
  in "<string>", line 3, column 5:
        standard: CakePHP
        ^
expected <block end>, but found '<scalar>'
  in "<string>", line 4, column 29:
        extensions: '.php,.ctp' branches:
                                ^