Add a quote attributed to Mark Twain but not verified
Add a quote attributed to Mark Twain but not verified

Change-Id: Ib461330ec0a9b20d812a73995da768c0d4e9644e
GitHub-Last-Rev: dbe27ce1df0ed3ed8f683a66ab0eb088eb2314ed
GitHub-Pull-Request: golang/scratch#10
Reviewed-on: https://go-review.googlesource.com/91155
Reviewed-by: Andrew Bonventre <682ad9f487f614f19e8b7cc5d340bdc8e1c1b128@golang.org>

golang/scratch