Add module docstring

.bin/pomo

@@ -1,11 +1,11 @@
-#!/usr/bin/env python
+# /usr/bin/env python3
+"""
+Pomodoro timer
 
-# Pomodoro timer
-#
-# - Writes pomodoro timer to temporary file so dwmblocks
-#   statusbar can read it
-# - Notification on session finish
-# - Notification on break finish
+- Writes pomodoro timer to temporary file so statusbar can read it
+- Notification on session finish
+- Notification on break finish
+"""
 
 import os
 import atexit