Decorator-validation

add ``make_validator`` decorator

add examples

Major cleanup

removal of unnecessary decorators
code cleanup
interface improvement for beter uix

Bugfix Type-Overries in check_types

What's Changed
* update to 3.0.0 with new check_types method by ahartlba in https://github.com/ahartlba/decorator_validation/pull/26
* Update decorators.py by ahartlba in https://github.com/ahartlba/decorator_validation/pull/28
* Update decorators.py by ahartlba in https://github.com/ahartlba/decorator_validation/pull/29


**Full Changelog**: https://github.com/ahartlba/decorator_validation/compare/3.0.0...3.0.1

create new check_types

Hotfix in doc

Add ``check_types`` function for direct, no-extra-code type-checking