Cleanup coverage data (python-zeroconf#858)

Author: bdraco

.coveragerc

@@ -2,3 +2,4 @@
 exclude_lines = 
     pragma: no cover
     if TYPE_CHECKING:
+    if sys.version_info

zeroconf/__init__.py

@@ -97,8 +97,8 @@
     "ZeroconfServiceTypes",
 ]
 
-if sys.version_info <= (3, 6):
-    raise ImportError(
+if sys.version_info <= (3, 6):  # pragma: no cover
+    raise ImportError(  # pragma: no cover
         '''
 Python version > 3.6 required for python-zeroconf.
 If you need support for Python 2 or Python 3.3-3.4 please use version 19.1

zeroconf/const.py

@@ -20,6 +20,7 @@
     USA
 """
 
+import contextlib
 import re
 import socket
 
@@ -39,10 +40,8 @@
 _MDNS_ADDR = '224.0.0.251'
 _MDNS_ADDR_BYTES = socket.inet_aton(_MDNS_ADDR)
 _MDNS_ADDR6 = 'ff02::fb'
-try:
+with contextlib.suppress(OSError):  # can't use AF_INET6, IPv6 is disabled
     _MDNS_ADDR6_BYTES = socket.inet_pton(socket.AF_INET6, _MDNS_ADDR6)
-except OSError:  # can't use AF_INET6, IPv6 is disabled
-    pass
 _MDNS_PORT = 5353
 _DNS_PORT = 53
 _DNS_HOST_TTL = 120  # two minute for host records (A, SRV etc) as-per RFC6762