Fix phpstan problems

Author: mtk3d

phpstan.neon

@@ -8,21 +8,6 @@ parameters:
 		- tests
 		- generators
 	ignoreErrors:
-		-
-			message: "#^Method Munus\\\\Collection\\\\Map\\:\\:tail\\(\\) should return Munus\\\\Collection\\\\Traversable\\<V\\> but returns Munus\\\\Tuple\\.$#"
-			count: 1
-			path: src/Collection/Map.php
-
-		-
-		    message: "#Method Munus\\\\Collection\\\\Stream\\\\Collectors::averaging\\(\\) should return Munus\\\\Collection\\\\Stream\\\\Collector\\<T, float\\|int\\> but returns Munus\\\\Collection\\\\Stream\\\\Collector\\\\GenericCollector\\<mixed, float\\|int\\|Munus\\\\Tuple\\>.#"
-		    count: 1
-		    path: src/Collection/Stream/Collectors.php
-
-		-
-		    message: "#Unreachable statement - code above always terminates.#"
-		    count: 1
-		    path: src/Collection/Iterator.php
-
 		-
 		    message: "#Template type T of method#"
 		    count: 6
@@ -32,4 +17,3 @@ parameters:
 		    message: "#Method Munus\\\\Value::toStream\\(\\) should return Munus\\\\Collection\\\\Stream\\<T\\> but returns Munus\\\\Collection\\\\Stream\\\\Cons\\<Munus\\\\Collection\\\\Stream\\|T\\>.#"
 		    count: 1
 		    path: src/Value.php
-