fix: revert primitive_types4 (rust-lang#296)

Author: jrvidal

exercises/primitive_types/primitive_types4.rs

@@ -7,4 +7,6 @@ fn slice_out_of_array() {
     let a = [1, 2, 3, 4, 5];
 
     let nice_slice = &a[1..4];
+
+    assert_eq!([2, 3, 4], nice_slice)
 }

exercises/primitive_types/primitive_types4.rs.orig

@@ -8,8 +8,9 @@ fn slice_out_of_array() {
 
 <<<<<<< HEAD
     let nice_slice = &a[1..4];
+=======
+    let nice_slice = ???
 
     assert_eq!([2, 3, 4], nice_slice)
-=======
->>>>>>> feature: makes "compile" exercise print output, resolves #270
+>>>>>>> fix: revert primitive_types4 (#296)
 }