Update request urllib3 (#464)

* requests: updated to version 2.27.1

* urllib3: updated to version 1.26.18

lib/requests/exceptions.py

@@ -8,6 +8,8 @@ This module contains the set of Requests' exceptions.
 """
 from urllib3.exceptions import HTTPError as BaseHTTPError
 
+from .compat import JSONDecodeError as CompatJSONDecodeError
+
 
 class RequestException(IOError):
     """There was an ambiguous exception that occurred while handling your
@@ -25,6 +27,14 @@ class RequestException(IOError):
         super(RequestException, self).__init__(*args, **kwargs)
 
 
+class InvalidJSONError(RequestException):
+    """A JSON error occurred."""
+
+
+class JSONDecodeError(InvalidJSONError, CompatJSONDecodeError):
+    """Couldn't decode the text into json"""
+
+
 class HTTPError(RequestException):
     """An HTTP error occurred."""
 
@@ -70,11 +80,11 @@ class TooManyRedirects(RequestException):
 
 
 class MissingSchema(RequestException, ValueError):
-    """The URL schema (e.g. http or https) is missing."""
+    """The URL scheme (e.g. http or https) is missing."""
 
 
 class InvalidSchema(RequestException, ValueError):
-    """See defaults.py for valid schemas."""
+    """The URL scheme provided is either invalid or unsupported."""
 
 
 class InvalidURL(RequestException, ValueError):
@@ -94,11 +104,11 @@ class ChunkedEncodingError(RequestException):
 
 
 class ContentDecodingError(RequestException, BaseHTTPError):
-    """Failed to decode response content"""
+    """Failed to decode response content."""
 
 
 class StreamConsumedError(RequestException, TypeError):
-    """The content for this response was already consumed"""
+    """The content for this response was already consumed."""
 
 
 class RetryError(RequestException):
@@ -106,21 +116,18 @@ class RetryError(RequestException):
 
 
 class UnrewindableBodyError(RequestException):
-    """Requests encountered an error when trying to rewind a body"""
+    """Requests encountered an error when trying to rewind a body."""
 
 # Warnings
 
 
 class RequestsWarning(Warning):
     """Base warning for Requests."""
-    pass
 
 
 class FileModeWarning(RequestsWarning, DeprecationWarning):
     """A file was opened in text mode, but Requests determined its binary length."""
-    pass
 
 
 class RequestsDependencyWarning(RequestsWarning):
     """An imported dependency doesn't match the expected version range."""
-    pass