Merge pull request #740 from michael-o/proper-encoding

JSONTokener(InputStream) violates rfc8259#section-8.1 (#739)

src/main/java/org/json/JSONTokener.java

@@ -1,6 +1,7 @@
 package org.json;
 
 import java.io.*;
+import java.nio.charset.Charset;
 
 /*
 Public Domain.
@@ -56,7 +57,7 @@ public class JSONTokener {
      * @param inputStream The source.
      */
     public JSONTokener(InputStream inputStream) {
-        this(new InputStreamReader(inputStream));
+        this(new InputStreamReader(inputStream, Charset.forName("UTF-8")));
     }