Fix linter errors

sbws/core/generate.py

@@ -2,7 +2,7 @@ from sbws.globals import (fail_hard, is_initted)
 from sbws.lib.v3bwfile import V3BwHeader
 from sbws.lib.resultdump import ResultSuccess
 from sbws.lib.resultdump import load_recent_results_in_datadir
-from sbws.util.timestamp import unixts_to_isodt_str, unixts_to_str
+from sbws.util.timestamp import unixts_to_isodt_str
 from argparse import ArgumentDefaultsHelpFormatter
 from statistics import median
 import os

tests/unit/lib/test_v3bwfile.py

 # -*- coding: utf-8 -*-
 """Test generation of bandwidth measurements document (v3bw)"""
 from sbws.globals import SPEC_VERSION
-from sbws.lib.v3bwfile import V3BwHeader, TERMINATOR, LINE_SEP, KEYVALUE_SEP_V110
+from sbws.lib.v3bwfile import (V3BwHeader, TERMINATOR, LINE_SEP,
+                               KEYVALUE_SEP_V110)
 from sbws import __version__ as version
 
 timestamp = 1523974147