regex build broken on nightly since 1.0.1

[ramosbugs]

The build seems to be broken on nightly:

$ cargo +nightly check
error[E0658]: macro is_x86_feature_detected! is unstable (see issue #0)
  --> src/vector/avx2.rs:11:12
   |
11 |         if is_x86_feature_detected!("avx2") {
   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(stdsimd)] to the crate attributes to enable

error[E0658]: macro is_x86_feature_detected! is unstable (see issue #0)
  --> src/vector/ssse3.rs:23:12
   |
23 |         if is_x86_feature_detected!("ssse3") {
   |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(stdsimd)] to the crate attributes to enable

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0658`.
error: Could not compile `regex`.

To learn more, run the command again with --verbose.

1.0.0 seems to build fine, but 1.0.1 and 1.0.2 show the above error. Looks to be related to #490.

[ramosbugs]

Oops, it looks like I was using an outdated version of nightly. Build is fine on latest :-)