fix(Fetch): invalid encoding if deserializing with non-UTF-8 JVM

Closes #49

nodes/src/main/java/io/aexp/nodes/graphql/Fetch.java

@@ -25,6 +25,7 @@
 import java.io.IOException;
 import java.net.HttpURLConnection;
 import java.net.URL;
+import java.nio.charset.StandardCharsets;
 import java.util.List;
 import java.util.Map;
 
@@ -64,7 +65,9 @@ <T> GraphQLResponseEntity<T> send(GraphQLRequestEntity requestEntity, Class<T> r
             } catch(IOException exception) {
                 inputStream = connection.getErrorStream();
             }
-            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
+            // Force stream reader to use UTF-8 for parsing, in order for deserialization not to use invalid
+            // encoding when reading from the underlying stream during JSON parsing
+            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
 
             Wrapper<T> wrapper = deserializeResponse(bufferedReader, responseClass);