Make also compatible to pip package pyxdg

jsoncache/ApplicationCache.py

@@ -10,10 +10,16 @@ import time
 
 # tries to follow XDG Base Directory Specification, if it fails due to a missing module, uses default cache dir ~/.cache
 try:
-    import xdg
-    CACHE_DIR = xdg.xdg_cache_home()
+    # pip package: pyxdg
+    import xdg.BaseDirectory
+    CACHE_DIR = Path(xdg.BaseDirectory.xdg_cache_home)
 except ModuleNotFoundError:
-    CACHE_DIR = Path.home() / ".cache"
+    try:
+        # pip package: xdg
+        import xdg
+        CACHE_DIR = xdg.xdg_cache_home()
+    except ModuleNotFoundError:
+        CACHE_DIR = Path.home() / ".cache"
 
 GZIP_MAGIC_NUMBER = b'\x1f\x8b'
 IDENTITY = lambda x: x