Remove unnecessary 'extern crate's in Rust 2018 edition, import macros
https://rust-lang-nursery.github.io/edition-guide/print.html#no-more-extern-crate https://rust-lang-nursery.github.io/edition-guide/rust-2018/macros/macro-changes.html https://github.com/iceiix/steven/pull/13#issuecomment-435702507
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@ -13,7 +13,7 @@
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// limitations under the License.
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use sha1::{self, Digest};
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use serde_json;
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use serde_json::json;
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use reqwest;
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#[derive(Clone, Debug)]
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