v0.1.7: Speed up 2–5%, improve --help & modernize

This is a collection of minor help fixes and modernizations, reducing
the total amount of code and speeding things up slightly.

Author: emk

scrubcsv/Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "scrubcsv"
-version = "0.1.6"
+version = "0.1.7"
 authors = ["Eric Kidd <[email protected]>"]
 edition = "2018"
 

scrubcsv/Cargo.toml

@@ -74,10 +74,10 @@ This is designed to be relatively fast.  For comparison purposes, on
 particular laptop:
 
 - `cat /dev/zero | pv > /dev/null` shows a throughput of about 5 GB/s.
-- The raw output string-writing routines in `scrubcsv` can reach about 3.5
-  GB/s.
+- The original raw output string-writing routines in `scrubcsv` could reach
+  about 3.5 GB/s.
 - The `csv` parser can reach roughly 235 MB/s in zero-copy mode.
-- With full processing, `scrubcsv` hits 67 MB/s.
+- With various levels of processing, `scrubcsv` hits 49 to 125 MB/s.
 - A lot of old-school C command-line tools hit about 50 to 75 MB/s.
 
 Unfortunately, we can't really use `csv`'s zero-copy mode because we need