text: Title: pymorphy2 0.9.1 is released
  Body: Want to contribute to DeepPavlov? Please read the [contributing guideline](http://docs.deeppavlov.ai/en/master/devguides/contribution_guide.html) first.
  
  
  **What problem are we trying to solve?**:
  
  Current `pymorphy2` requirement [is obsolete](https://github.com/deepmipt/DeepPavlov/blob/0.12.1/requirements.txt#L11) in DeepPavlov.
  `pymorphy2 0.9.1` [was released](https://github.com/kmike/pymorphy2/releases/tag/0.9.1).
  See also: https://github.com/kmike/pymorphy2/issues/125, https://github.com/kmike/pymorphy2/issues/133.
  
  **How can we solve it?**:
  ```
  pymorphy2==0.9.1
  ````