Fix lint errors

tracetools_analysis/test/tracetools_analysis/test_processor.py

@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from inspect import signature
 from typing import Dict
 import unittest
 
@@ -64,6 +63,7 @@ class WrongHandler(EventHandler):
     ) -> None:
         pass
 
+
 class TestProcessor(unittest.TestCase):
 
     def __init__(self, *args) -> None: