fixes #80 - Indentation on multi-line method calls

Author: Bozhidar Batsov

README.md

@@ -157,6 +157,41 @@ You can generate a PDF or an HTML copy of this guide using
     end
     ```
 
+* Align the parameters of a method call if they span over multiple lines.
+
+    ```Ruby
+    # starting point (line is too long)
+    def send_mail(source)
+      Mailer.deliver(to: 'bob@example.com', from: 'us@example.com', subject: 'Important message', body: source.text)
+    end
+
+    # bad (normal indent)
+    def send_mail(source)
+      Mailer.deliver(
+        to: 'bob@example.com',
+        from: 'us@example.com',
+        subject: 'Important message',
+        body: source.text)
+    end
+
+    # bad (double indent)
+    def send_mail(source)
+      Mailer.deliver(
+          to: 'bob@example.com',
+          from: 'us@example.com',
+          subject: 'Important message',
+          body: source.text)
+    end
+
+    # good
+    def send_mail(source)
+      Mailer.deliver(to: 'bob@example.com',
+                     from: 'us@example.com',
+                     subject: 'Important message',
+                     body: source.text)
+    end
+    ```
+
 * Use RDoc and its conventions for API documentation.  Don't put an
   empty line between the comment block and the `def`.
 * Keep lines fewer than 80 characters.