Default FILE to tmux.conf before .tmux.conf

tmux-up

@@ -18,7 +18,7 @@ then
 
 		The FILE argument is used to bootstrap the new tmux session if it doesn't
 		already exist. It must contain tmux-compatible commands, which will be
-		passed to tmux. Defaults to: .tmux.conf
+		passed to tmux. Defaults to: tmux.conf OR .tmux.conf
 
 		  --help     display this help and exit
 		  --version  output version information and exit
@@ -41,11 +41,14 @@ fi
 if [ -f "$1" ]
 then
   FILE=$1
+elif [ -f 'tmux.conf' ]
+then
+  FILE='tmux.conf'
 elif [ -f '.tmux.conf' ]
 then
   FILE='.tmux.conf'
 else
-  echo "$0: cannot stat ‘${1:-.tmux.conf}’: No such file"
+  echo "$0: cannot stat ‘${1:-tmux.conf}’: No such file"
   exit 1
 fi