swiftsim : substituted tag with corresponding commit

var/spack/repos/builtin/packages/swiftsim/package.py

@@ -38,7 +38,7 @@ class Swiftsim(Package):
     homepage = 'http://icc.dur.ac.uk/swift/'
     url = 'http://gitlab.cosma.dur.ac.uk/swift/swiftsim/repository/archive.tar.gz?ref=v0.3.0'
 
-    version('0.3.0', git='https://gitlab.cosma.dur.ac.uk/swift/swiftsim.git', tag='v0.3.0')
+    version('0.3.0', git='https://gitlab.cosma.dur.ac.uk/swift/swiftsim.git', commit='254cc1b563b2f88ddcf437b1f71da123bb9db733')
 
     variant('mpi', default=True, description='Enable distributed memory parallelism')