Remove Python 2.7 dependency (#306)

Author: tony

libtmux/session.py

@@ -11,7 +11,6 @@
 import os
 
 from . import exc, formats
-from ._compat import text_type
 from .common import (
     EnvironmentMixin,
     TmuxMappingObject,
@@ -96,7 +95,7 @@ def cmd(self, *args, **kwargs):
             Renamed from ``.tmux`` to ``.cmd``.
         """
         # if -t is not set in any arg yet
-        if not any('-t' in text_type(x) for x in args):
+        if not any('-t' in str(x) for x in args):
             # insert -t immediately after 1st arg, as per tmux format
             new_args = [args[0]]
             new_args += ['-t', self.id]