Update uvloop to 0.10.0 (#74)

This PR updates [uvloop](https://pypi.org/project/uvloop) from **0.9.1** to **0.10.0**.



<details>
  <summary>Changelog</summary>
  
  
   ### 0.10.0
   ```
   New Features
============

* Initial support Python 3.7.
  (by pfreixes in c3a5ec8e for 138)

* Implement PEP 567 support (contextvars module) for Python 3.7.
  (by 1st1 in 2a4fab44, 878e4163, and b2bdaae3 for 155)

* Add uvloop&#39;s own version of `asyncio/sslproto.py`. SSL is now ~50% faster.
  (by 1st1 in 4d912643)

* Convert Future-returning loop methods to coroutines.
  (by 1st1 in 7384b22f)

* Allow file objects to be passed to `loop.subprocess*` functions.
  (by 1st1 in f0830901 for 136)

* Make signals processing more reliable.
  (by 1st1 in 6e03e513)

* Prohibit adding a signal handler for `SIGCHLD`.
  (by 1st1 in cd53b7f5 for 156)

* Add `uvloop.__version__`.
  (by 1st1 in 740cb7f3 for 137)


Bug Fixes
=========

* Upgrade to Cython 0.28.2.
  (by 1st1 in 98bdb553 for 122)

* Update libuv from v1.17.0 to v1.20.3.
  (by 1st1 in 572524a6)

* Make sure UDP handles are cleaned-up properly.
  (by 1st1 in 13f63e00)

* Fix `subprocess.close()` to let its processes die gracefully.
  (by 1st1 in a78e4d27 and a455af3d for 128)

* Fix `sock_connect()` to resolve addresses for correct socket family.
  (by 1st1 in ce2bd4fb for 139)

* Fix a race condition in SSL handshake.
  (by 1st1 in 447e124f)
   ```
   
  
</details>


 

<details>
  <summary>Links</summary>
  
  - PyPI: https://pypi.org/project/uvloop
  - Changelog: https://pyup.io/changelogs/uvloop/
  - Repo: http://github.com/MagicStack/uvloop
</details>

requirements.txt

@@ -2,7 +2,7 @@ click==6.7
 six==1.11.0
 firebase-admin==2.10.0
 
-uvloop==0.9.1
+uvloop==0.10.0
 aiohttp==3.2.1
 cchardet==2.1.1
 aiodns==1.1.1