Update formatter to new place marker

Author: istathar

examples/golden/ManyAttributes.t

@@ -0,0 +1,30 @@
+% technique v1
+
+making_coffee :
+
+These are the steps.
+
+    1.  First
+        @chef
+            -   First sub task
+            -   Second sub task
+    2.  Second
+        @chef + @barista
+            -   Third sub task
+            -   Fourth sub task
+    3.  Third
+        ^kitchen
+            -   Fifth sub task
+            -   Sixth sub task
+    4.  Four
+        ^kitchen + ^bathroom
+            -   Seventh sub task
+            -   Eighth sub task
+    5.  Five
+        @chef + ^bathroom
+            -   Ninth sub task
+            -   Tenth sub task
+    6.  Six
+        ^kitchen + @barista
+            -   Ninth sub task
+            -   Tenth sub task

src/formatting/formatter.rs

@@ -866,7 +866,7 @@ impl<'i> Formatter<'i> {
                     self.add_fragment_reference(Syntax::Attribute, name.0);
                 }
                 Attribute::Place(name) => {
-                    self.add_fragment_reference(Syntax::Attribute, "#");
+                    self.add_fragment_reference(Syntax::Attribute, "^");
                     self.add_fragment_reference(Syntax::Attribute, name.0);
                 }
             }