Use infinity-agent if defaultMaxSockets is 5

package.json

@@ -39,7 +39,7 @@
   ],
   "dependencies": {
     "duplexify": "^3.2.0",
-    "infinity-agent": "^0.1.0",
+    "infinity-agent": "^0.2.0",
     "isstream": "^0.1.1",
     "object-assign": "^2.0.0",
     "prepend-http": "^1.0.0",

readme.md

@@ -79,7 +79,7 @@ Milliseconds after which the request will be aborted and an error event with `ET
 
 [http.Agent](http://nodejs.org/api/http.html#http_class_http_agent) instance.
 
-Node HTTP/HTTPS [Agent in 0.10.35](https://github.com/joyent/node/blob/v0.10.35-release/lib/http.js#L1261) by default limits number of open sockets to 5 — which is a too low. By default `got` will use `new Agent({maxSockets: Infinity})` like new [`Agent` in 0.11.14](https://github.com/joyent/node/blob/v0.11.14-release/lib/_http_agent.js#L110).
+Node HTTP/HTTPS Agent in [0.10](https://github.com/joyent/node/blob/v0.10.35-release/lib/http.js#L1261) by default limits number of open sockets to 5 — which is a too low. If `options.agent` is not defined `got` will use [infinity-agent](https://github.com/floatdrop/infinity-agent) to backport `defaultMaxSockets` from [0.11](https://github.com/joyent/node/blob/v0.11.14-release/lib/_http_agent.js#L110).
 
 [Why pooling is evil](https://github.com/substack/hyperquest#pooling-is-evil).