Update deprecated love.filesystem calls

lurker.lua

@@ -15,9 +15,17 @@ local lurker = { _version = "1.0.1" }
 
 
 local dir = love.filesystem.enumerate or love.filesystem.getDirectoryItems
-local isdir = love.filesystem.isDirectory
 local time = love.timer.getTime or os.time
-local lastmodified = love.filesystem.getLastModified
+
+local function isdir(path)
+    local info = love.filesystem.getInfo(path)
+    return info.type == "directory"
+end
+
+local function lastmodified(path)
+    local info = love.filesystem.getInfo(path, "file")
+    return info.modtime
+end
 
 local lovecallbacknames = {
   "update",
@@ -259,4 +267,3 @@ end
 
 
 return lurker.init()
-