Indent the parameter list more if the body is a wrapped "=>". Fix #144.

test/splitting/parameters.unit

Index: test/splitting/parameters.unit
diff --git a/test/splitting/parameters.unit b/test/splitting/parameters.unit
index 986eaa14ae4ece521ab50098bcd610531a3de14d..56d43f249fd1ec1c6f19b309f4c9c617d926cec4 100644
--- a/test/splitting/parameters.unit
+++ b/test/splitting/parameters.unit
@@ -8,3 +8,9 @@ class Foo {
   Foo(this.first, this.second,
       this.third, this.fourth);
 }
+>>> indent parameters more if body is a wrapped =>
+method(int firstArgument, int argumentTwo) => "very long body that must wrap";
+<<<
+method(int firstArgument,
+        int argumentTwo) =>
+    "very long body that must wrap";