Update unstable library feature list by Travis CI build 1572

Author: Travis CI

unstable_library_feature.txt

@@ -16,7 +16,7 @@ process_exitcode_placeholder        48711    2018-03-03 18:29:30 -0800  2018-03-
 wrapping_int_impl                   32463    2018-03-06 23:17:49 -0500  2018-03-26 16:46:04 -0400
 proc_macro_internals                27812    2018-03-16 01:09:22 +0200  2018-04-02 08:19:32 -0700
 wrapping_next_power_of_two          32463    2018-05-15 12:52:16 -0400  2020-09-04 14:20:01 +0000
-allocator_api                       32838    2018-05-31 18:36:51 +0200  2020-10-06 16:37:23 +0200
+allocator_api                       32838    2018-05-31 18:36:51 +0200  2020-11-18 17:23:41 +0100
 alloc_error_hook                    51245    2018-06-14 00:32:30 +0200  2018-06-14 00:32:30 +0200
 integer_atomics                     32976    2018-09-08 12:50:19 +0100  2018-09-08 12:50:19 +0100
 slice_partition_dedup               54279    2018-09-08 15:33:02 +0200  2018-09-08 15:33:02 +0200
@@ -74,7 +74,7 @@ cow_is_borrowed                     65143    2019-10-05 18:23:37 -0400  2019-10-
 with_options                        65439    2019-10-07 13:32:07 +0100  2019-10-07 13:32:07 +0100
 structural_match                    31434    2019-10-17 10:54:37 +0200  2019-10-17 10:54:37 +0200
 map_first_last                      62924    2019-10-20 20:06:20 +0200  2020-04-05 18:56:07 +0200
-vec_into_raw_parts                  65816    2019-10-22 12:48:52 -0400  2019-10-22 12:48:52 -0400
+vec_into_raw_parts                  65816    2019-10-22 12:48:52 -0400  2020-11-18 17:23:41 +0100
 array_value_iter                    65798    2019-10-25 10:50:21 +0200  2019-10-25 10:50:21 +0200
 unwrap_infallible                   61695    2019-11-02 20:13:32 +0200  2019-11-02 20:13:32 +0200
 unsafe_cell_raw_get                 66358    2019-11-13 09:07:52 +0100  2019-11-13 09:07:52 +0100
@@ -206,3 +206,4 @@ restricted_std                      none     2020-11-10 19:01:21 +0100  2020-11-
 btree_retain                        79025    2020-11-13 10:23:50 -0800  2020-11-13 10:23:50 -0800
 nonzero_leading_trailing_zeros      79143    2020-11-17 19:29:15 +0100  2020-11-17 19:29:15 +0100
 array_value_iter_slice              65798    2020-11-19 08:28:49 +0100  2020-11-19 08:28:49 +0100
+slice_fill_with                     79221    2020-11-20 01:42:43 +0100  2020-11-20 01:42:43 +0100