gnu: Add python-mando-0.3.1

* gnu/packages/python.scm (python-mando-0.3.1): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/python.scm

@@ -13947,3 +13947,20 @@ recognize TestCases.")
 
 (define-public python2-mando
   (package-with-python2 python-mando))
+
+(define-public python-mando-0.3.1
+  ;; python-radon (version 1.5.0) has a requirement
+  ;; for mando<0.4,>=0.3
+  (package
+    (inherit python-mando)
+    (name "python-mando")
+    (version "0.3.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "https://github.com/rubik/mando/archive/v"
+                           version
+                           ".tar.gz"))
+       (sha256
+        (base32
+         "17jlkdpqw22z1nyml5ybslilqkzmnk0dxxjml8bfghav1l5hbwd2"))))))