Replace double by single quotes in example (bash compatibility)

[kpym]

In the README.md your example

csvq "select id, name from `user.csv`"

do not work in bash because the back ticks are executed (bash is looking to run user.csv and capture its output). My suggestion is to use single quotes:

csvq 'select id, name from `user.csv`'

[mithrandie]

You are right, single quotes are more appropriate. Thank you.