Update unstable library feature list by Travis CI build 1509

Author: Travis CI

unstable_library_feature.txt

@@ -132,7 +132,6 @@ write_all_vectored                  70436    2020-03-31 15:16:43 +0200  2020-03-
 arc_mutate_strong_count             71983    2020-04-03 13:10:13 +0200  2020-04-03 13:10:13 +0200
 slice_fill                          70758    2020-04-03 22:53:55 +0200  2020-04-03 22:53:55 +0200
 ready_macro                         70922    2020-04-05 17:50:45 +0200  2020-04-05 17:50:45 +0200
-or_insert_with_key                  71024    2020-04-11 08:46:12 -0400  2020-09-22 19:34:05 +0100
 slice_ptr_len                       71146    2020-04-14 21:34:27 +0200  2020-05-06 07:43:18 +0200
 refcell_take                        71395    2020-04-21 20:03:50 +0200  2020-04-21 20:03:50 +0200
 proc_macro_is_available             71436    2020-04-22 11:07:07 -0700  2020-04-22 11:07:07 -0700
@@ -162,6 +161,7 @@ deque_range                         74217    2020-07-10 09:23:52 -0400  2020-07-
 slice_ptr_get                       74265    2020-07-12 12:48:43 +0200  2020-08-06 11:45:54 +0200
 fmt_as_str                          74442    2020-07-17 15:59:31 +0200  2020-07-17 15:59:31 +0200
 once_cell                           74465    2020-07-18 10:09:47 +1000  2020-07-27 11:22:36 +0200
+available_concurrency               74479    2020-07-18 17:11:46 +0200  2020-07-18 17:11:46 +0200
 proc_macro_tracked_env              74690    2020-07-22 21:08:01 +0300  2020-07-22 21:08:01 +0300
 str_split_once                      74773    2020-07-24 09:39:09 +0200  2020-07-24 09:39:09 +0200
 set_ptr_value                       75091    2020-07-31 10:07:18 +0200  2020-07-31 10:07:18 +0200
@@ -192,6 +192,7 @@ unix_socket_peek                    76923    2020-09-19 21:55:01 +0700  2020-09-
 num_as_ne_bytes                     76976    2020-09-20 15:49:43 +0800  2020-09-20 15:49:43 +0800
 command_access                      44434    2020-09-21 11:32:06 -0700  2020-09-21 11:32:06 -0700
 atomic_from_mut                     76314    2020-09-21 20:42:40 +0200  2020-09-21 20:42:40 +0200
+or_insert_with_key                  71024    2020-09-22 19:34:05 +0100  2020-10-12 08:44:53 -0400
 array_from_ref                      77101    2020-09-23 13:48:21 +0200  2020-09-23 13:48:21 +0200
 iter_advance_by                     77404    2020-10-01 16:52:22 +0200  2020-10-01 16:52:22 +0200
 slice_partition_at_index            55300    2020-10-06 21:54:05 -0400  2020-10-06 21:54:05 -0400