gnu: Add julia-websockets.

* gnu/packages/julia-xyz.scm (julia-websockets-1.5.2): New variable.

gnu/packages/julia-xyz.scm

@@ -991,3 +991,29 @@ packages faster, maybe.  It supports specifying glue code in packages which
 will load automatically when a another package is loaded, so that explicit
 dependencies (and long load times) can be avoided.")
     (license license:expat)))
+
+(define-public julia-websockets
+  (package
+    (name "julia-websockets")
+    (version "1.5.2")
+    (source
+     (origin
+       (method git-fetch)
+       (uri
+        (git-reference
+         (url "https://github.com/JuliaWeb/WebSockets.jl")
+         (commit
+          (string-append "v" version))))
+       (file-name "WebSockets")
+       (sha256
+        (base32 "1fpvskbax88x059lwnl211ps13j8s2jf97agwwr69sir11i0xh51"))))
+    (propagated-inputs
+     `(("julia-http" ,julia-http)
+       ("julia-requires" ,julia-requires)))
+    (build-system julia-build-system)
+    (home-page "https://github.com/JuliaWeb/WebSockets.jl")
+    (synopsis "WebSockets library for Julia")
+    (description "Server and client side Websockets protocol in Julia.
+WebSockets is a small overhead message protocol layered over TCP.  It uses
+HTTP(S) for establishing the connections.")
+    (license license:expat)))