Make timestamp header a default.

naive-nlu/tree_nlu/session/org_mode.py

@@ -3,7 +3,6 @@ import datetime
 
 SESSION = None
 
-
 def __gen_session_name__():
     now = datetime.datetime.utcnow()
     return "treeNLU-session-{}.org".format(
@@ -25,6 +24,11 @@ def global_session():
     return SESSION
 
 
+def get_header():
+    now = datetime.datetime.utcnow()
+    return ("# Ran on {}\n".format(
+        now.strftime("%y/%m/%d %H:%M:%S.%f")))
+
 class LevelContext:
     def __init__(self, increaser, decreaser):
         self.increaser = increaser
@@ -43,6 +47,8 @@ class OrgModeSession:
         self.level = 0
         self.dirty = False
 
+        self.f.write(get_header())
+
     def annotate(self, annotation):
         if self.dirty:
             self.f.write("{indentation} {data}\n".format(