message: Formal display name and description
  Modeled from the Hg extension
diff: {
  "name": "svn-scm",
  - "displayName": "svn-scm",
  - "description": "",
  + "displayName": "SVN",
  + "description": "Integrated Subversion source control",
  "version": "0.8.3",
  "publisher": "johnstoncode",
  "engines": {
  