modify zadd calls for redis-py 3.0 (#1016)

* modify zadd calls for redis-py 3.0

redis-py 3.0 changes the zadd interface that accepts a single
mapping argument that is expected to be a dict.
https://github.com/andymccurdy/redis-py#mset-msetnx-and-zadd

* change FailedQueue.push_job_id to always push a str

redis-py 3.0 does not attempt to cast values to str and is left
to the user.

* remove Redis connection patching

Since in redis-py 3.0, Redis == StrictRedis class, we no longer
need to patch _zadd and other methods.
Ref: https://github.com/rq/rq/pull/1016#issuecomment-441010847

1 files changed, 1 insertions, 1 deletions

diff --git a/requirements.txt b/requirements.txt
index 291ee5b..7c061a7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-redis>=2.7
+redis>=3.0
 click>=3.0.0