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

test/splitting/constructors.unit

Index: test/splitting/constructors.unit
diff --git a/test/splitting/constructors.unit b/test/splitting/constructors.unit
index 0d7e474bba80689d976cb75cb612486d80e2b3ce..99a932eb98e5aa814a17d24eb27e31a5d4d98248 100644
--- a/test/splitting/constructors.unit
+++ b/test/splitting/constructors.unit
@@ -47,4 +47,14 @@ class Foo {
   Foo(int longArg1, int longArg2,
       int longArg3)
       : this._(longArg1);
-}
+}
+>>> indent parameters more if body is a wrapped =>
+class Foo {
+  Foo(firstArgument, secondArgument, third) => "very long body that must wrap";
+}
+<<<
+class Foo {
+  Foo(firstArgument, secondArgument,
+          third) =>
+      "very long body that must wrap";
+}