Update gmp to 6.1.0

var/spack/packages/gmp/package.py

@@ -31,6 +31,7 @@ class Gmp(Package):
     homepage = "https://gmplib.org"
     url      = "https://gmplib.org/download/gmp/gmp-6.0.0a.tar.bz2"
 
+    version('6.1.0' , '86ee6e54ebfc4a90b643a65e402c4048')
     version('6.0.0a', 'b7ff2d88cae7f8085bd5006096eed470')
     version('6.0.0' , '6ef5869ae735db9995619135bd856b84')