Note tested / supported versions of Redis in the Readme (#79)

* Note tested / supported versions of Redis server and client in the Readme

* Update Redis version noted in Readme to 4.0+

* Add a matrix of Redis servers for CI

* Clarify Redis server and client versions in Readme

Author: lewispb

.github/workflows/ci.yml

@@ -5,7 +5,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [2.7, "3.0"]
+        redis_server: ["4", "5", "6.2"]
+        ruby: ["2.7", "3.0"]
+
+    name: Redis server ${{ matrix.redis_server }} - Ruby ${{ matrix.ruby }}
 
     steps:
       - uses: actions/checkout@v2
@@ -16,10 +19,10 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true
 
-      - name: Set up Redis 4
+      - name: Set up Redis ${{ matrix.redis_server }}
         uses: supercharge/[email protected]
         with:
-          redis-version: 4
+          redis-version: ${{ matrix.redis_server }}
 
       - name: Run tests
         run: bin/test

README.md

@@ -210,6 +210,10 @@ Additional configurations can be added under `config/redis/*.yml` and referenced
 
 Kredis passes the configuration to `Redis.new` to establish the connection. See the [Redis documentation](https://github.com/redis/redis-rb) for other configuration options.
 
+### Redis support
+
+Kredis works with Redis server 4.0+, with the [Redis Ruby](https://github.com/redis/redis-rb) client version 4.2+.
+
 ### Setting SSL options on Redis Connections
 
 If you need to connect to Redis with SSL, the recommended approach is to set your Redis instance manually by adding an entry to the `Kredis::Connections.connections` hash. Below an example showing how to connect to Redis using Client Authentication: