fix lock file

tests/fixtures/projects/demo-package/pdm.lock

@@ -50,6 +50,10 @@ marker = "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3,
 summary = "The comprehensive WSGI web application library."
 
 [metadata]
+content_hash = "md5:92328aa4daee3c17db4cacecec062624"
+lock_version = "0.1.0"
+
+[metadata.files]
 "click 7.1.2" = [
     {file = "click-7.1.2-py2.py3-none-any.whl", hash = "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"},
     {file = "click-7.1.2.tar.gz", hash = "sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a"},
@@ -105,7 +109,3 @@ summary = "The comprehensive WSGI web application library."
     {file = "Werkzeug-1.0.1-py2.py3-none-any.whl", hash = "sha256:2de2a5db0baeae7b2d2664949077c2ac63fbd16d98da0ff71837f7d1dea3fd43"},
     {file = "Werkzeug-1.0.1.tar.gz", hash = "sha256:6c80b1e5ad3665290ea39320b91e1be1e0d5f60652b964a3070216de83d2e47c"},
 ]
-
-[root]
-content_hash = "md5:92328aa4daee3c17db4cacecec062624"
-meta_version = "0.0.1"