Update plugin manifest for pre-release.

Author: enlight

MercurialSourceControl.uplugin

@@ -1,10 +1,12 @@
 {
     "FileVersion" : 3,
 
+	"Version" : 1,
+	"VersionName" : "0.1",
 	"FriendlyName" : "Mercurial",
 	"CreatedBy" : "Vadim Macagon",
 	"CreatedByURL" : "https://github.com/enlight/ue4-hg-plugin",
-	"Description" : "Mercurial source control provider.",
+	"Description" : "Allows the Editor to interact with the Mercurial distributed version control system. Supports basic add, remove, revert, commit operations, provides access to asset history, and enables built-in visual diffing of Blueprints.",
 	"Category" : "Editor.Source Control",
 
     "Modules" :