fix hash

packages/nest/package.py

@@ -26,7 +26,7 @@ class Nest(CMakePackage):
     git      = "https://github.com/nest/nest-simulator.git"
 
     version('master', branch='master')
-    version('3.4',    sha256='037012200489ad4f800ed5dc6279917e89c831d101a4b852b5c42278923566a3')
+    version('3.4',    sha256='c56699111f899045ba48e55e87d14eca8763b48ebbb3648beee701a36aa3af20')
     version('3.3',    sha256='179462b966cc61f5785d2fee770bc36f86745598ace9cd97dd620622b62043ed')
     version('3.2',    sha256='583d5725882ad5e8fd4fc7ffab425da97cbbb91fadbc327e940c184e8892b958')
     patch('nest-simulator-3.2-p1-VersionNumber.patch', when='@3.2')