update README with added options

README.md

@@ -37,7 +37,7 @@ use responsibly.
 
 ```
 usage: impatient [-h] [-f FINAL] [-i INTERVAL] [-w WINDOW] [-d DECAY]
-                 (-p PATH | -c COMMAND)
+                 [-V FRACTION] [-I COUNT] [-l PATH] (-p PATH | -c COMMAND)
 
 Display progress and time estimates for arbitrary tasks
 
@@ -55,6 +55,20 @@ optional arguments:
                         Decay coefficient for older samples (default 1). Must
                         be between 0 and 1 inclusive. The lower this is, the
                         more responsive/swingy the estimate will be.
+  -V FRACTION, --termination-value-threshold FRACTION
+                        Fraction of the expected final value that must be
+                        reached in order to terminate (default 0.95). Reaching
+                        this threshold is necessary but not sufficient, see
+                        also -I
+  -I COUNT, --termination-inactivity-threshold COUNT
+                        Number of consecutive unchanged samples that must be
+                        observed in order to terminate (default 10). Reaching
+                        this threshold is necessary but not sufficient, see
+                        also -V
+  -l PATH, --log-file PATH
+                        File to log the time series to. Will be saved as a
+                        csv, with columns for timestamp and for value. Will
+                        append data if the file already exists.
   -p PATH, --path PATH  Track total disk usage of a given path
   -c COMMAND, --command COMMAND
                         Track value returned by a shell command; this should