Fix a small inconsistency in the .null assertion docs

Fix `ownPropertyDescriptor` tests

Fix minimalist typo in doc example

Add `propertyDescriptor` assertion

Release v2.2.0

Tweak documentation on `.deep` flag.

Escaping dot should be taken in deep property

This commit includes:
* getPathInfo handles escaping `.[]`
* Documentation added to `.property`
*...

* removing backslash prior to "."
* test case: "foo\\.bar" names {"foo.bar": "baz"}

Release v2.1.2

Add Keith Cirkel to CONTRIBUTING.md

No longer using eval on assert operator #386

Update `git summary` in README

Release v2.1.1

fix indexing into array with deep propery

* added unit test to expect with code from documentation
* added default to res in _getPathValue

Add missing docstring for showDiff argument of assert

config.truncateThreshold docs: simpler wording

Add a minor precision that empty asserts on strings too.

Getter for Should syntax now uses valueOf for primitives

This allows the should syntax to be more resilient when
dealing with modified primitive construc...

Release v2.1.0

Increment version to 2.0.1.

See https://github.com/chaijs/chai/issues/373

Fix travis.yml deploy

v2.0.0

Added fail() method to Should and Expect interfaces

Fix #265

- `.keys(object)n => .keys(Object.keys(Object)`
- added exceptions for 'if first arg is non-stri...

Arrays passed to `.keys()` assertions are sorted (unexpectedly) by side-effect

Update copyright date

add the which chain method as per issue #347

Added `change`, `increase` and `decrease` assertions with `by` chain (#330)

Expose the util package through the chai object

The chai util object has a lot of useful functions that can be used
outside of the context of as...