look up _vendor by absolute instead of relative

Author: tony

tmuxp/log.py

@@ -20,8 +20,8 @@
 import logging.handlers
 import sys
 import time
-from ._vendor.colorama import init
-from ._vendor.colorama import Fore, Back, Style
+from tmuxp._vendor.colorama import init
+from tmuxp._vendor.colorama import Fore, Back, Style
 from .util import unicode, bytes, basestring
 
 try: