fix(tmux_cmd): Fix error in raise (#450)

Author: tony

CHANGES

@@ -14,6 +14,10 @@ $ pip install --user --upgrade --pre libtmux
 
 <!-- Maintainers and contributors: Insert change notes for the next release above -->
 
+### Bug fix
+
+- `tmux_cmd()`: Fix raise of TmuxCommandNotFound (#450)
+
 ## libtmux 0.15.8 (2022-10-02)
 
 ### Bug fix

src/libtmux/common.py

@@ -233,7 +233,7 @@ class tmux_cmd:
     def __init__(self, *args: t.Any, **kwargs: t.Any) -> None:
         tmux_bin = shutil.which("tmux")
         if not tmux_bin:
-            raise (exc.TmuxCommandNotFound)
+            raise exc.TmuxCommandNotFound()
 
         cmd = [tmux_bin]
         cmd += args  # add the command arguments to cmd