Support json with UTF-8 bom in VersionInterceptor.

Previously it was peeking at response body and put it into intermediate
string that later used in json parsing. This preserves bom character
and leads to parse fail. Now it passes peek body input stream to
json parser that handles bom internally.

Signed-off-by: Yahor Berdnikau <egorr.berd@gmail.com>

subsonic-api/src/integrationTest/kotlin/org/moire/ultrasonic/api/subsonic/interceptors/VersionInterceptorTest.kt

@@ -44,6 +44,16 @@ class VersionInterceptorTest : BaseInterceptorTest() {
                 .protocolVersion `should equal` SubsonicAPIVersions.V1_13_0
     }
 
+    @Test
+    fun `Should update version from response with utf-8 bom`() {
+        mockWebServerRule.enqueueResponse("ping_ok_utf8_bom.json")
+
+        client.newCall(createRequest {}).execute()
+
+        (interceptor as VersionInterceptor)
+                .protocolVersion `should equal` SubsonicAPIVersions.V1_16_0
+    }
+
     @Test
     fun `Should not update version if response json doesn't contain version`() {
         mockWebServerRule.enqueueResponse("non_subsonic_response.json")

subsonic-api/src/integrationTest/resources/ping_ok_utf8_bom.json

@@ -0,0 +1,4 @@
+{"subsonic-response":{
+  "status": "ok",
+  "version": "1.16.0"
+}}

subsonic-api/src/main/kotlin/org/moire/ultrasonic/api/subsonic/interceptors/VersionInterceptor.kt

@@ -48,8 +48,7 @@ internal class VersionInterceptor(
     }
 
     private fun tryUpdateProtocolVersion(response: Response) {
-        val content = response.peekBody(DEFAULT_PEEK_BYTE_COUNT)
-                .byteStream().bufferedReader().readText()
+        val content = response.peekBody(DEFAULT_PEEK_BYTE_COUNT).byteStream()
 
         try {
             val jsonReader = jsonFactory.createParser(content)