Dropped reference to gson internal API

* JSON class is ignored by swagger code gen
* please document process around swagger code-gen so people can contribute
* please separate generated code from developed code

kubernetes/src/main/java/io/kubernetes/client/JSON.java

@@ -3,7 +3,7 @@
  * No description provided (generated by Swagger Codegen https://github.com/swagger-api/swagger-codegen)
  *
  * OpenAPI spec version: v1.6.9
- * 
+ *
  *
  * NOTE: This class is auto generated by the swagger code generator program.
  * https://github.com/swagger-api/swagger-codegen.git
@@ -16,7 +16,6 @@
 import com.google.gson.GsonBuilder;
 import com.google.gson.JsonParseException;
 import com.google.gson.TypeAdapter;
-import com.google.gson.internal.bind.util.ISO8601Utils;
 import com.google.gson.stream.JsonReader;
 import com.google.gson.stream.JsonWriter;
 
@@ -33,7 +32,6 @@
 import java.lang.reflect.Type;
 import java.text.DateFormat;
 import java.text.ParseException;
-import java.text.ParsePosition;
 import java.util.Date;
 
 public class JSON {
@@ -290,7 +288,7 @@ public java.sql.Date read(JsonReader in) throws IOException {
                     if (dateFormat != null) {
                         return new java.sql.Date(dateFormat.parse(date).getTime());
                     }
-                    return new java.sql.Date(ISO8601Utils.parse(date, new ParsePosition(0)).getTime());
+                    return new java.sql.Date(ISODateTimeFormat.basicDateTime().parseMillis(date));
                 } catch (ParseException e) {
                     throw new JsonParseException(e);
                 }
@@ -326,7 +324,7 @@ public void write(JsonWriter out, Date date) throws IOException {
                 if (dateFormat != null) {
                     value = dateFormat.format(date);
                 } else {
-                    value = ISO8601Utils.format(date, true);
+                    value = ISODateTimeFormat.basicDateTime().print(date.getTime());
                 }
                 out.value(value);
             }
@@ -345,7 +343,7 @@ public Date read(JsonReader in) throws IOException {
                         if (dateFormat != null) {
                             return dateFormat.parse(date);
                         }
-                        return ISO8601Utils.parse(date, new ParsePosition(0));
+                        return ISODateTimeFormat.basicDateTime().parseDateTime(date).toDate();
                     } catch (ParseException e) {
                         throw new JsonParseException(e);
                     }