rm MCaptcha::decrement_visitor

CHANGELOG.md

@@ -25,6 +25,10 @@
 - `System::get_pow` returns `errors::CaptchaResult<Option<PoWConfig>>`
   instead of `Option<PoWConfig>`
 
+## Removed
+- `MCaptcha::decrement_visiotr`: seemed redundant when
+  `MCaptcha::decrement_visitor_by` was available
+
 ## 0.1.3
 
 ## Added

src/master/embedded/counter.rs

@@ -111,7 +111,7 @@ struct DeleteVisitor;
 impl Handler<DeleteVisitor> for Counter {
     type Result = ();
     fn handle(&mut self, _msg: DeleteVisitor, _ctx: &mut Self::Context) -> Self::Result {
-        self.0.decrement_visitor();
+        self.0.decrement_visitor_by(1);
     }
 }
 

src/mcaptcha.rs

@@ -99,14 +99,6 @@ impl MCaptcha {
         }
     }
 
-    /// decrements the visitor count by one
-    #[inline]
-    pub fn decrement_visitor(&mut self) {
-        if self.visitor_threshold > 0 {
-            self.visitor_threshold -= 1;
-        }
-    }
-
     /// decrements the visitor count by specified count
     #[inline]
     pub fn decrement_visitor_by(&mut self, count: u32) {