Support semver metadata in plugin version

plugin/src/Config.lua

@@ -1,6 +1,6 @@
 return {
 	codename = "Epiphany",
-	version = {0, 5, 0},
+	version = {0, 5, 0, "-alpha.0"},
 	expectedServerVersionString = "0.5.0 or newer",
 	protocolVersion = 2,
 	defaultHost = "localhost",

plugin/src/Version.lua

@@ -34,7 +34,13 @@ function Version.compare(a, b)
 end
 
 function Version.display(version)
-	return table.concat(version, ".")
+	local output = ("%d.%d.%d"):format(version[1], version[2], version[3])
+
+	if version[4] ~= nil then
+		output = output .. version[4]
+	end
+
+	return output
 end
 
-return Version
+return Version