* Add disable_skip_errors flag to ConventionChecker API

Added to ConventionChecker.check_source() and ConventionChecker.check().
This allows other systems that integrate pydocstyle,
such as flake8-docstyle, to request errors that are otherwise
skipped due to # noqa comments.

Added test for skip_errors feature in general and with this flag.

Fixes #484

* Update release notes

* rename argument to ignore inline noqa comments

* Add docstring description of new argument

* Move release note

Co-authored-by: Sambhav Kothari <sambhavs.email@gmail.com>

* Test on Python 3.9-dev

* Upgrade mypy to fix 'syntax error in type comment' with Python 3.9

* Drop support for Python 3.5

* Upgrade Python syntax with pyupgrade --py36-plus

* Drop support for Python 3.5

* Remove D302, redundant now Python 2 is dropped

If a docstring starts with "Package" it's probably something like:

```python
"""Package the files into a tarball."""
```

So don't flag it in D401.

Co-authored-by: Sambhav Kothari <sambhavs.email@gmail.com>

* Add black and isort to tox and reformat the code

* Reformat comments and violations

* Added tests for parsing "One line functions"
The tests look valid but don't pass.

from debugging looks like the parser cant find the decorator, although it has no problem finding the function and accepting it as valid.

* Fix parser.py to work on one line functions.

* PEP8 fixes.

* Adding a test for multiple decorators over a "single line function".

* Added tests for single line function with decorator.
1. oneliner_with_decorator_expecting_errors(): The decorator is not ignored, expecting the D400, D415 errors.
2. valid_oneliner_with_decorator(): A valid one line function that shouldn't produce any errors.

* Added tests for single line function with decorator.
1. oneliner_with_decorator_expecting_errors(): The decorator is not ignored, expecting the D400, D415 errors.
2. valid_oneliner_with_decorator(): A valid one line function that shouldn't produce any errors.

Co-authored-by: Sambhav Kothari <sambhavs.email@gmail.com>

… add D418 (#511)

* Preventing the D103 error when the function is decorated with @overload.

Added an is_overload method in the function class(parser.py).

Added an if statement so that the D103 error will not trigger when decorated with @overload(checker.py)

Added some tests to see that it's working correctly.

* Preventing the D103 error when the function is decorated with @overload.

Added an is_overload method in the function class(parser.py).

Added an if statement so that the D103 error will not trigger when decorated with @overload(checker.py)

Added some tests to see that it's working correctly.

* Added an is_overload method in the function class(parser.py).

Added an if statement so that the D103 error will not trigger when decorated with @overload(checker.py)

Added some tests to see that it's working correctly.

* Fixing overload test.

* Fixing overload test.
Running isort src/pydocstyle

* Added D418 Error: Function decorated with @overload shouldn\'t contain a docstring.

* Overloaded functions shouldn't have a definition.

* Tests for D418 error:
Functions decorated with @overload

* Tests for D418 error:
Functions decorated with @overload

* Tests for D418 error:
Functions decorated with @overload

* Added Tests for nested_functions/methods that are decorated with @overload

checker is also preventing the 102 error in methods that are decorated with @overload.

(checker.py) Any suggestions on how to write those if statements more elegantly? I really don't like the nested if statement.

* Added Tests for valid overloaded functions, valid overloaded Method and overloaded Methods with D418 Error.

* Added Tests for valid overloaded nested functions.

* release_notes.rst updated.

* release_notes.rst updated.

* update release notes for #499

* update release notes for #499