Fix minor typing issues.

volatility/framework/automagic/stacker.py

@@ -155,7 +155,7 @@ class LayerStacker(interfaces.automagic.AutomagicInterface):
                                    context: interfaces.context.ContextInterface,
                                    config_path: str,
                                    requirement: interfaces.configuration.RequirementInterface,
-                                   stacked_layers: [str]) -> typing.Optional[typing.Tuple[str, str]]:
+                                   stacked_layers: typing.List[str]) -> typing.Optional[typing.Tuple[str, str]]:
         """Looks for translation layer requirements and attempts to apply the stacked layers to it.  If it succeeds
         it returns the configuration path and layer name where the stacked nodes were spliced into the tree.
 

volatility/plugins/timeliner.py

@@ -36,7 +36,7 @@ class Timeliner(plugins.PluginInterface):
         """Takes a timeline, sorts it and output the data from each relevant row from each plugin"""
         for (timestamp, colname, timestamp_column, node, treegrid) in sorted(self.timeline, key = self.sortkey):
             # Render node data as string
-            data = []
+            data = [] # type: typing.List[str]
             # TODO: Ideally the text renderer could render a single row as a string, so we could reuse it here
             for column in treegrid.columns:
                 data += [column.name + ": {}".format(getattr(node.values, treegrid.sanitize_name(column.name)))]