Add missing exceptions.InvalidKeyError to jwt module __init__ imports. (jpadilla#620)

* Add missing exceptions.InvalidKeyError to jwt module __init__ imports.

* flake8

* Update CHANGELOG.rst

Co-authored-by: José Padilla <jpadilla@webapplicate.com>

Author: aarcamp

CHANGELOG.rst

@@ -21,6 +21,7 @@ Added
 ~~~~~
 
 - Add caching by default to PyJWKClient `#611 <https://github.com/jpadilla/pyjwt/pull/611>`__
+- Add missing exceptions.InvalidKeyError to jwt module __init__ imports `#620 <https://github.com/jpadilla/pyjwt/pull/620>`__
 - Add support for ES256K algorithm `#629 <https://github.com/jpadilla/pyjwt/pull/629>`__
 
 `v2.0.1 <https://github.com/jpadilla/pyjwt/compare/2.0.0...2.0.1>`__

jwt/__init__.py

@@ -13,6 +13,7 @@
     InvalidAudienceError,
     InvalidIssuedAtError,
     InvalidIssuerError,
+    InvalidKeyError,
     InvalidSignatureError,
     InvalidTokenError,
     MissingRequiredClaimError,
@@ -55,6 +56,7 @@
     "InvalidAudienceError",
     "InvalidIssuedAtError",
     "InvalidIssuerError",
+    "InvalidKeyError",
     "InvalidSignatureError",
     "InvalidTokenError",
     "MissingRequiredClaimError",