Replace python-memcached with pylibmc (#296)

* Replace python-memcached with pylibmc

Author: asherf

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
         pip install -U "pip>=21.1"
         pip install -U setuptools "tox>=3.23.0,<4" codecov tox-gh-actions coverage
         sudo apt-get update
-        sudo apt-get install binutils libproj-dev gdal-bin
+        sudo apt-get install binutils libproj-dev gdal-bin libmemcached-dev
     - name: Log versions
       run: |
         python --version

django_prometheus/cache/backends/memcached.py

@@ -7,7 +7,7 @@
 )
 
 
-class MemcachedCache(memcached.MemcachedCache):
+class MemcachedCache(memcached.PyLibMCCache):
     """Inherit memcached to add metrics about hit/miss ratio"""
 
     def get(self, key, default=None, version=None):

requirements.txt

@@ -8,4 +8,4 @@ mysqlclient
 psycopg2
 pytest==6.2.5
 pytest-django
-python-memcached
+pylibmc