Don't suggest installing types-pycrypto (#10603)

It doesn't exist, since it was removed from typeshed in October (python/typeshed#4606). Similarly, pynamodb was removed in January.

I haven't tracked down what happened to pyre-extensions in typeshed, but https://pypi.org/project/types-pyre-extensions/ doesn't exist and in any case mypy users presumably don't need it.

mypy/stubinfo.py

@@ -18,7 +18,6 @@
     'concurrent': 'types-futures',
     'contextvars': 'types-contextvars',
     'croniter': 'types-croniter',
-    'Crypto': 'types-pycrypto',
     'cryptography': 'types-cryptography',
     'dataclasses': 'types-dataclasses',
     'dateparser': 'types-dateparser',
@@ -56,8 +55,6 @@
     'pycurl': 'types-pycurl',
     'pymssql': 'types-pymssql',
     'pymysql': 'types-PyMySQL',
-    'pynamodb': 'types-pynamodb',
-    'pyre_extensions': 'types-pyre-extensions',
     'pyrfc3339': 'types-pyRFC3339',
     'python2': 'types-six',
     'pytz': 'types-pytz',

test-data/unit/fine-grained-modules.test

@@ -2193,13 +2193,13 @@ import waitress
 [file a.py.2]
 # nothing
 [file a.py.3]
-import pynamodb
+import requests
 [out]
 a.py:1: error: Library stubs not installed for "waitress" (or incompatible with Python 3.6)
 a.py:1: note: Hint: "python3 -m pip install types-waitress"
 a.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
 ==
 ==
-a.py:1: error: Library stubs not installed for "pynamodb" (or incompatible with Python 3.6)
-a.py:1: note: Hint: "python3 -m pip install types-pynamodb"
+a.py:1: error: Library stubs not installed for "requests" (or incompatible with Python 3.6)
+a.py:1: note: Hint: "python3 -m pip install types-requests"
 a.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports