add reset data feature

In case the application is upgraded, we might want to reset app rate
dialog data. So the dialog will be showed after some days or several
time used.

library/src/main/java/hotchemi/android/rate/AppRate.java

@@ -83,6 +83,12 @@ public AppRate clearAgreeShowDialog() {
         return this;
     }
 
+    public AppRate clearSettingsParam() {
+        PreferenceHelper.setAgreeShowDialog(context, true);
+        PreferenceHelper.clearSharedPreferences(context);
+        return this;
+    }
+
     public AppRate setAgreeShowDialog(boolean clear) {
         PreferenceHelper.setAgreeShowDialog(context, clear);
         return this;