Fix broken link to Normalizing State Shape article
Fix broken link to Normalizing State Shape article

Updating broken link to article: Redux Normalizing State Shape documentation.
From: http://redux.js.org/docs/recipes/reducers/NormalizingStateShape.html
To: https://redux.js.org/recipes/structuring-reducers/normalizing-state-shape/
revolver-app/vuex-orm,revolver-app/vuex-orm