Fix linting issues

Author: rhpvorderman

tests/test_igzip_lib.py

@@ -68,7 +68,6 @@ def test_compress_decompress(level, flag: Flag, mem_level, hist_bits):
     assert decomp == DATA
 
 
-
 class TestIgzipDecompressor():
     # Tests adopted from CPython's test_bz2.py
     TEXT = DATA
@@ -222,4 +221,4 @@ def test_failure(self):
             igzd.decompress(self.BAD_DATA * 30)
         # Make sure there are no internal consistencies
         with pytest.raises(Exception):
-            igzd.decompress(self.BAD_DATA * 30)
+            igzd.decompress(self.BAD_DATA * 30)