gnu: Add rust-average-0.9.

* gnu/packages/crates-io.scm (rust-average-0.9): New variable.

gnu/packages/crates-io.scm

@@ -558,6 +558,40 @@ (define-public rust-autocfg-0.1
           "1chwgimpx5z7xbag7krr9d8asxfqbh683qhgl9kn3hxk2l0djj8x"))))
     (arguments '(#:skip-build? #t))))
 
+(define-public rust-average-0.9
+  (package
+    (name "rust-average")
+    (version "0.9.4")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "average" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "1f8ya00bv6qki9m7b4lb3bn845rj473mx02qpm7wgy5qc1yp75xs"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-conv" ,rust-conv-0.3)
+        ("rust-float-ord" ,rust-float-ord-0.2)
+        ("rust-num-integer" ,rust-num-integer-0.1)
+        ("rust-num-traits" ,rust-num-traits-0.2)
+        ("rust-serde" ,rust-serde-1.0)
+        ("rust-serde-big-array" ,rust-serde-big-array-0.1)
+        ("rust-serde-derive" ,rust-serde-derive-1.0))
+       #:cargo-development-inputs
+       (("rust-bencher" ,rust-bencher-0.1)
+        ("rust-quantiles" ,rust-quantiles-0.7)
+        ("rust-rand" ,rust-rand-0.6)
+        ("rust-serde-json" ,rust-serde-json-1.0)
+        ("rust-streaming-stats" ,rust-streaming-stats-0.2))))
+    (home-page "https://github.com/vks/average")
+    (synopsis "Calculate statistics iteratively")
+    (description "This crate provides for calculating statistics iteratively
+in Rust.")
+    (license (list license:asl2.0 license:expat))))
+
 (define-public rust-backtrace-0.3
   (package
     (name "rust-backtrace")