remove 2 more unnecessary `progn`s
Add attribution to @jaycfields in README
use save-excursion and char-after to cleanup code from my last commit
escape the `?"` as `?\"`
replace another goto-char with save-excursion
reduce duplication by using cljr--delete-and-extract-sexp in 3 more places
replace a few `let*`s with `let`s