Remove circle badge

Author: sfackler

README.md

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 # rust-openssl
 
-[![CircleCI](https://circleci.com/gh/sfackler/rust-openssl.svg?style=shield)](https://circleci.com/gh/sfackler/rust-openssl)
 [![crates.io](https://img.shields.io/crates/v/openssl.svg)](https://crates.io/crates/openssl)
 
 OpenSSL bindings for the Rust programming language.