E0067 needs to be updated to new format

[sophiajt]

From: src/test/compile-fail/E0067.rs

Error E0067 needs a span_label, updating it from:

error[E0067]: invalid left-hand side expression
  --> src/test/compile-fail/E0067.rs:14:5
   |
14 |     LinkedList::new() += 1; //~ ERROR E0368
   |     ^^^^^^^^^^^^^^^^^

To:

error[E0067]: invalid left-hand side expression
  --> src/test/compile-fail/E0067.rs:14:5
   |
14 |     LinkedList::new() += 1; //~ ERROR E0368
   |     ^^^^^^^^^^^^^^^^^ invalid expression for left-hand side

[clementmiao]

I would like to take this issue. First time compiler hacker :)