Merge pull request #441 from crytic/dev-reentrancy-0.6

Improve reentrancy detector for Solidity >=0.6

slither/slithir/operations/high_level_call.py

@@ -103,7 +103,7 @@ class HighLevelCall(Call, OperationWithLValue):
         :return: bool
         '''
         # If solidity >0.5, STATICCALL is used
-        if self.slither.solc_version and self.slither.solc_version.startswith('0.5.'):
+        if self.slither.solc_version and self.slither.solc_version >= '0.5.0':
             if isinstance(self.function, Function) and (self.function.view or self.function.pure):
                 return False
             if isinstance(self.function, Variable):