[Audio] Lavalink 3.0/3.1 compatibility updates (#2272)

- Update to red-lavalink v0.2.0 (blocked by Cog-Creators/Red-Lavalink#41)
- Force lavalink to use TLSv1.2 on java 11+ (blocked by #2270)

I would add equalizer support, but there's no way to know the full
Lavalink version and thus whether it's supported ahead of time.

setup.py

@@ -60,7 +60,7 @@ extras_require = {
         "sphinxcontrib-websupport==1.1.0",
         "urllib3==1.24.1",
     ],
-    "voice": ["red-lavalink==0.1.2"],
+    "voice": ["red-lavalink==0.2.0"],
     "style": ["black==18.9b0", "click==7.0", "toml==0.10.0"],
 }