Close transit input stream after reading response (#565)

Connections are not closing immediately after coercing the body using transit.
This is a regression introduced in #475.
Previously, the response body always was also transferred into an intermediate
byte-array which will read bytes until the stream is empty, and automatically
close the connection.

Since we no longer have this implicit behavior, the body coercion middleware
must close the inputstream after reading a value.

Fixes #564

src/clj_http/client.clj

@@ -485,7 +485,8 @@
   {:pre [transit-enabled?]}
   (let [charset (or charset (response-charset resp))
         body (if (can-parse-body? request resp)
-               (parse-transit (util/force-stream body) type transit-opts)
+               (with-open [in (util/force-stream body)]
+                 (parse-transit in type transit-opts))
                (util/force-string body charset))]
     (assoc resp :body body)))