eventstreams: stop checking requests version

pywikibot requires requests>=2.21.0

Change-Id: I3525f7fee43280d5d45f86934229ec6e822b5692

pywikibot/comms/eventstreams.py

@@ -19,8 +19,6 @@
 import json
 from functools import partial
 
-from pkg_resources import parse_version
-from requests import __version__ as requests_version
 from requests.packages.urllib3.exceptions import ProtocolError
 from requests.packages.urllib3.util.response import httplib
 
@@ -35,12 +33,6 @@
     EventSource = e
 
 
-if parse_version(requests_version) < parse_version('2.20.1'):
-    raise ImportError(
-        'requests >= 2.20.1 is required for EventStreams;\n'
-        "install it with 'pip install \"requests>=2.20.1\"'\n")
-
-
 class EventStreams(GeneratorWrapper):
 
     """Generator class for Server-Sent Events (SSE) protocol.
@@ -142,8 +134,10 @@ def __init__(self, **kwargs) -> None:
            parameter.
         """
         if isinstance(EventSource, Exception):
-            raise ImportError('sseclient is required for EventStreams;\n'
-                              'install it with "pip install sseclient"\n')
+            raise ImportError(
+                'sseclient is required for EventStreams;\n'
+                'install it with "pip install sseclient==0.0.22"\n'
+            )
         self.filter = {'all': [], 'any': [], 'none': []}
         self._total = None
         self._canary = kwargs.pop('canary', False)