Allow object as a function param typehint

Here's a first pass at a patch

I couldn’t find easily the api within phpcs to determine the targeted php version - it would likely be better to use that than the actual current version. There is a flag: --config-set php_version

Since object as a type hint would fail in php < 7.2 I'm not sure I agree it should be supported unconditionally. I guess the code would fail, so maybe it's fine?

There is some related code already in squizlabs:

squizlabs/php_codesniffer/src/Standards/Squiz/Sniffs/Commenting/FunctionCommentSniff.php

                if ($this->phpVersion >= 70200) {
                    if ($suggestedName === 'object') {
                        $suggestedTypeHint = 'object';
                    }
                }

PR: https://github.com/pfrenssen/coder/pull/47

Here's a patch from the PR. It does have an added test case