chore: Remove unneeded badges

Author: Muscraft

Cargo.toml

@@ -10,9 +10,6 @@ readme = "README.md"
 keywords = ["code", "analysis", "ascii", "errors", "debug"]
 
 [badges]
-travis-ci = { repository = "rust-lang/annotate-snippets-rs", branch = "master" }
-coveralls = { repository = "rust-lang/annotate-snippets-rs", branch = "master", service = "github" }
-
 maintenance = { status = "actively-developed" }
 
 [dependencies]

README.md

@@ -4,7 +4,6 @@
 
 [![crates.io](https://img.shields.io/crates/v/annotate-snippets.svg)](https://crates.io/crates/annotate-snippets)
 ![build status](https://github.com/rust-lang/annotate-snippets-rs/actions/workflows/ci.yml/badge.svg)
-[![Coverage Status](https://coveralls.io/repos/github/rust-lang/annotate-snippets-rs/badge.svg?branch=master)](https://coveralls.io/github/rust-lang/annotate-snippets-rs?branch=master)
 
 The library helps visualize meta information annotating source code slices.
 It takes a data structure called `Snippet` on the input and produces a `String`