added __call__ method (#33)

src/middle-earth/call.py

@@ -0,0 +1,23 @@
+class Composer:
+    def __init__(self, *functions):
+        self.functions = reversed(functions)
+
+    def __call__(self, args):
+        for function in self.functions:
+            args = function(args)
+        return args
+
+
+if __name__ == "__main__":
+
+    def one(x):
+        return x + 1
+
+    def two(x):
+        return x + 2
+
+    def three(x):
+        return x + 3
+
+    call = Composer(one, two, three)
+    print(call(5))