Update vendored deps

news/2989.bugfix

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+Fixed a bug which caused canonicalized package names to fail to resolve against PyPI.

news/2989.vendor

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+Updated ``requirementslib`` to version ``1.1.9``.

pipenv/vendor/cerberus/LICENSE

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+ISC License
+
+Copyright (c) 2012-2016 Nicola Iarocci.
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.

pipenv/vendor/cerberus/__init__.py

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+"""
+    Extensible validation for Python dictionaries.
+
+    :copyright: 2012-2016 by Nicola Iarocci.
+    :license: ISC, see LICENSE for more details.
+
+    Full documentation is available at http://python-cerberus.org/
+
+"""
+
+from __future__ import absolute_import
+
+from cerberus.validator import DocumentError, Validator
+from cerberus.schema import (rules_set_registry, schema_registry, Registry,
+                             SchemaError)
+from cerberus.utils import TypeDefinition
+
+
+__version__ = "1.2"
+
+__all__ = [
+    DocumentError.__name__,
+    Registry.__name__,
+    SchemaError.__name__,
+    TypeDefinition.__name__,
+    Validator.__name__,
+    'schema_registry',
+    'rules_set_registry'
+]