Apply changes from the isort hook

Add the changes made from running the `isort` pre-commit hook against
the project.

Author: mcdonnnj

src/trustymail/__init__.py

@@ -1,4 +1,5 @@
 """The trustymail library."""
+# Standard Python Libraries
 from typing import List
 
 # We disable a Flake8 check for "Module imported but unused (F401)" here because

src/trustymail/cli.py

@@ -46,11 +46,13 @@
 Notes:
    If no scan type options are specified, all are run against a given domain/input.
 """
+# Standard Python Libraries
 # Built-in imports
 import errno
 import logging
 import os
 
+# Third-Party Libraries
 # Dependency imports
 import docopt
 
@@ -71,6 +73,7 @@ def main():
     # Monkey patching trustymail to make the PSL cache read-only
     if args["--psl-read-only"]:
         trustymail.PublicSuffixListReadOnly = True
+    # cisagov Libraries
     import trustymail.trustymail as tmail
 
     log_level = logging.WARN

src/trustymail/domain.py

@@ -1,11 +1,12 @@
-from datetime import datetime, timedelta
+# Standard Python Libraries
 from collections import OrderedDict
+from datetime import datetime, timedelta
 from os import path, stat
 
+# Third-Party Libraries
 import publicsuffix
 
-from . import PublicSuffixListReadOnly, PublicSuffixListFilename
-from . import trustymail
+from . import PublicSuffixListFilename, PublicSuffixListReadOnly, trustymail
 
 
 def get_psl():

src/trustymail/trustymail.py

@@ -1,21 +1,22 @@
+# Standard Python Libraries
+from collections import OrderedDict
 import csv
 import datetime
 import inspect
 import json
 import logging
 import re
-from collections import OrderedDict
-import requests
 import smtplib
 import socket
-import spf
 
+# Third-Party Libraries
 import DNS
 import dns.resolver
 import dns.reversename
+import requests
+import spf
 
-
-from .domain import get_public_suffix, Domain
+from .domain import Domain, get_public_suffix
 
 # A cache for SMTP scanning results
 _SMTP_CACHE = {}

tests/test_trustymail.py

@@ -1,3 +1,4 @@
+# Standard Python Libraries
 import unittest