bump libtmux to 0.7.7

tony · tony · commit b01982c3d178 · 2017-11-10T07:25:44.000-06:00
this has the fix for -x/-y when tmuxp is used inside tmux related: #312
diff --git a/requirements/base.txt b/requirements/base.txt
@@ -1,4 +1,4 @@
 kaptan>=0.5.7
-libtmux==0.7.5 # Updated from 0.7.4
+libtmux==0.7.7 # Updated from 0.7.6
 click==6.7
 colorama==0.3.9
