Update psycopg2 to 2.7.7 (#1507)
Update psycopg2 to 2.7.7 (#1507)

This PR updates [psycopg2](https://pypi.org/project/psycopg2) from **2.7.6.1** to **2.7.7**.



<details>
  <summary>Changelog</summary>
  
  
   ### 2.7.7
   ```
   ^^^^^^^^^^^^^^^^^^^^^^^^^^^

- Cleanup of the cursor results assignment code, which might have solved
  double free and inconsistencies in concurrent usage (:tickets:`346, 384`).
- Wheel package compiled against OpenSSL 1.0.2q.
   ```
   
  
</details>


 

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/psycopg2
  - Changelog: https://pyup.io/changelogs/psycopg2/
  - Homepage: http://initd.org/psycopg/
</details>


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