docs: remove duplicate line from README

We already say that this crate is inspired by certifi.io and uses CCADB
data in the line immediately preceding the one deleted in this commit.

README.md

@@ -8,9 +8,6 @@ The webpki-ccadb crate populates the root certificates for the webpki-roots crat
 using the data provided by the [Common CA Database (CCADB)](https://www.ccadb.org/).
 Inspired by [certifi.io](https://certifi.io/en/latest/).
 
-The webpki-roots crate is inspired by [certifi.io](https://certifi.io/en/latest/) and
-uses the data provided by the [Common CA Database (CCADB)](https://www.ccadb.org/).
-
 [![webpki-roots](https://github.com/rustls/webpki-roots/actions/workflows/build.yml/badge.svg?branch=main)](https://github.com/rustls/webpki-roots/actions/workflows/build.yml)
 [![Crate](https://img.shields.io/crates/v/webpki-roots.svg)](https://crates.io/crates/webpki-roots)