Update no_std feature to be compatible with nightly.

Author: kwantam

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "unicode-segmentation"
-version = "0.1.1"
+version = "0.1.2"
 authors = ["kwantam <kwantam@gmail.com>"]
 
 homepage = "https://github.com/unicode-rs/unicode-segmentation"

src/grapheme.rs

@@ -8,9 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#[cfg(feature = "no_std")]
-use core::prelude::*;
-
 #[cfg(feature = "no_std")]
 use core::cmp;
 

src/lib.rs

@@ -54,11 +54,7 @@
        html_favicon_url = "https://unicode-rs.github.io/unicode-rs_sm.png")]
 
 #![cfg_attr(feature = "no_std", no_std)]
-#![cfg_attr(feature = "no_std", feature(no_std, core, core_prelude, core_char_ext, core_slice_ext, core_str_ext))]
-
-#[cfg(feature = "no_std")]
-#[macro_use]
-extern crate core;
+#![cfg_attr(feature = "no_std", feature(no_std, core_char_ext, core_slice_ext, core_str_ext))]
 
 #[cfg(all(test, feature = "no_std"))]
 #[macro_use]

src/word.rs

@@ -8,9 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#[cfg(feature = "no_std")]
-use core::prelude::*;
-
 #[cfg(feature = "no_std")]
 use core::cmp;
 #[cfg(feature = "no_std")]