Use telnetlib3 instead of telnetlib (#3)

.github/workflows/build.yml

@@ -19,6 +19,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install pylint build
+          pip install -r requirements.txt
 
       - name: Run linter
         run: pylint -E tn3270

requirements.txt

@@ -0,0 +1 @@
+telnetlib3==2.0.4

setup.py

@@ -21,7 +21,7 @@
     author='Andrew Kay',
     author_email='projects@ajk.me',
     packages=['tn3270'],
-    install_requires=[],
+    install_requires=['telnetlib3'],
     long_description=LONG_DESCRIPTION,
     long_description_content_type='text/markdown',
     classifiers=[

tn3270/telnet.py

@@ -10,7 +10,7 @@
 import logging
 import socket
 import selectors
-from telnetlib import IAC, WILL, WONT, DO, DONT, SB, SE, BINARY, EOR, TTYPE, TN3270E
+from telnetlib3 import IAC, WILL, WONT, DO, DONT, SB, SE, BINARY, EOR, TTYPE, TN3270E
 
 # https://tools.ietf.org/html/rfc855
 RFC855_EOR = b'\xef'