Rename "registry" module to the "client"

tests/commands/test_lib.py

@@ -21,8 +21,8 @@ import pytest
 import semantic_version
 
 from platformio.commands.lib.command import cli as cmd_lib
+from platformio.package.client import RegistryClient
 from platformio.package.meta import PackageType
-from platformio.package.registry import RegistryClient
 from platformio.package.vcsclient import VCSClientFactory
 from platformio.project.config import ProjectConfig
 

tests/misc/test_misc.py

@@ -18,7 +18,7 @@ import pytest
 import requests
 
 from platformio import __check_internet_hosts__, http, proc
-from platformio.package.registry import RegistryClient
+from platformio.package.client import RegistryClient
 
 
 def test_platformio_cli():