Changed file extensions of init command from lua to luau (#831)

test-projects/plugins/test-plugin.luau

@@ -0,0 +1,20 @@
+print("test-plugin initializing...")
+
+return function(nextDispatch, entry)
+	if entry:isDirectory() then
+		return nextDispatch(entry)
+	end
+
+	local name = entry:fileName()
+	local instanceName = name:match("(.-)%.moon$")
+
+	if instanceName == nil then
+		return nextDispatch(entry)
+	end
+
+	return rojo.instance({
+		Name = instanceName,
+		ClassName = "ModuleScript",
+		Source = compileMoonScript(entry:contents()),
+	})
+end