Added frequencies of future verbs in action stats

[ThijsVroegh]

This pull request includes a change to the generate_action_analysis_results method in the orangecontrib/storynavigation/modules/actionanalysis.py file. The change involves updating the filtering criteria for story elements to include future tense verbs, so that the frequencies of future verbs are also shown in the action stats table.

Solves issue #154

• Updated generate_action_analysis_results method to include 'FUTURE_VB' in the filtering criteria for story_navigator_tag.

[ThijsVroegh]

Hi @erik. This PR is very small; in case you find the time?

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[eriktks]

I have tested the PR and indeed the words with the story_navigator_tag FUTURE_VB now appear in the output of the widget, which they previously did not. The code change does look reasonable to me. Thanks for making this update!