Make xgboost version same a sklearn

src/PyClassifiers/XGBoost.cc

@@ -2,12 +2,8 @@
 
 //See https ://stackoverflow.com/questions/36071672/using-xgboost-in-c
 namespace pywrap {
-    XGBoost::XGBoost() : PyClassifier("xgboost", "XGBClassifier")
+    XGBoost::XGBoost() : PyClassifier("xgboost", "XGBClassifier", true)
     {
         validHyperparameters = { "tree_method", "early_stopping_rounds", "n_jobs" };
     }
-    std::string XGBoost::version()
-    {
-        return callMethodString("1.0");
-    }
 } /* namespace pywrap */

src/PyClassifiers/XGBoost.h

@@ -7,7 +7,6 @@ namespace pywrap {
     public:
         XGBoost();
         ~XGBoost() = default;
-        std::string version();
     };
 } /* namespace pywrap */
 #endif /* XGBOOST_H */