appease pylint

slither/detectors/variables/var_read_using_this.py

@@ -1,4 +1,5 @@
 from typing import List
+from slither.core.cfg.node import Node
 from slither.core.declarations import Function, SolidityVariable
 from slither.detectors.abstract_detector import AbstractDetector, DetectorClassification
 from slither.slithir.operations.high_level_call import HighLevelCall
@@ -44,8 +45,9 @@ contract C {
 
         return results
 
-    def _detect_var_read_using_this(self, func: Function) -> List:
-        results = []
+    @staticmethod
+    def _detect_var_read_using_this(func: Function) -> List[Node]:
+        results: List[Node] = []
         for node in func.nodes:
             for ir in node.irs:
                 if isinstance(ir, HighLevelCall):