use 'Self' to refer to own type

Author: danieleades

src/builder.rs

@@ -271,7 +271,7 @@ impl ConfigBuilder<AsyncState> {
     /// Registers new [`Source`] in this builder.
     ///
     /// Calling this method does not invoke any I/O. [`Source`] is only saved in internal register for later use.
-    pub fn add_source<T>(mut self, source: T) -> ConfigBuilder<AsyncState>
+    pub fn add_source<T>(mut self, source: T) -> Self
     where
         T: Source + Send + Sync + 'static,
     {
@@ -282,7 +282,7 @@ impl ConfigBuilder<AsyncState> {
     /// Registers new [`AsyncSource`] in this builder.
     ///
     /// Calling this method does not invoke any I/O. [`AsyncSource`] is only saved in internal register for later use.
-    pub fn add_async_source<T>(mut self, source: T) -> ConfigBuilder<AsyncState>
+    pub fn add_async_source<T>(mut self, source: T) -> Self
     where
         T: AsyncSource + Send + Sync + 'static,
     {