gnu: Add rust-bytestring-0.1.

* gnu/packages/crates-io.scm (rust-bytestring-0.1): New variable.

gnu/packages/crates-io.scm

@@ -4248,6 +4248,30 @@ (define-public rust-bytes-0.3
        #:cargo-development-inputs
        (("rust-rand" ,rust-rand-0.3))))))
 
+(define-public rust-bytestring-0.1
+  (package
+    (name "rust-bytestring")
+    (version "0.1.5")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "bytestring" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "0qzkncgky5p5vsdb9msmfg6d92dcs9idcjcr5nk7inkja7x0az7w"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-bytes" ,rust-bytes-0.5)
+        ("rust-serde" ,rust-serde-1))
+       #:cargo-development-inputs
+       (("rust-serde-json" ,rust-serde-json-1))))
+    (home-page "https://actix.rs")
+    (synopsis "UTF-8 encoded string with Bytes as a storage")
+    (description
+     "This package provides a UTF-8 encoded string with Bytes as a storage.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-bzip2-0.4
   (package
     (name "rust-bzip2")