gnu: python-pyaml: Update to 18.11.0.

* gnu/packages/python.scm (python-pyaml): Update to 18.11.0.

gnu/packages/python.scm

@@ -9759,13 +9759,13 @@ (define-public python2-faker
 (define-public python-pyaml
   (package
     (name "python-pyaml")
-    (version "17.7.2")
+    (version "18.11.0")
     (source (origin
               (method url-fetch)
               (uri (pypi-uri "pyaml" version))
               (sha256
                (base32
-                "132grrw0ajq4nrappi3ldbkb952k7yn9b6c7csi2rmvzm1g6ppp2"))))
+                "0fi604ix8lbpj1266q7js6szm771saprdzzcdwmj43wy83694qmr"))))
     (build-system python-build-system)
     (native-inputs
      `(("python-unidecode" ,python-unidecode)))