Remove some @TargetApi

app/src/main/java/com/hippo/preference/DialogPreference.java

@@ -16,14 +16,12 @@
 
 package com.hippo.preference;
 
-import android.annotation.TargetApi;
 import android.app.Dialog;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.SharedPreferences;
 import android.content.res.TypedArray;
 import android.graphics.drawable.Drawable;
-import android.os.Build;
 import android.os.Bundle;
 import android.os.Parcel;
 import android.os.Parcelable;
@@ -79,12 +77,6 @@ public abstract class DialogPreference extends Preference implements
         init(context, attrs, defStyleAttr, 0);
     }
 
-    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
-    public DialogPreference(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
-        super(context, attrs, defStyleAttr, defStyleRes);
-        init(context, attrs, defStyleAttr, defStyleRes);
-    }
-
     private void init(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
         final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.DialogPreference, defStyleAttr, defStyleRes);
         mDialogTitle = a.getString(R.styleable.DialogPreference_dialogTitle);