fix(badge): adjust style (yamafaktory#38)

Author: yamafaktory

Cargo.lock

@@ -15,8 +15,8 @@ version = "1.3.7"
 [dependencies]
 indexmap = { version = "1.9.2", features = ["rayon"] }
 itertools = "0.10.5"
-rayon = "1.6.0"
-thiserror = "1.0.37"
+rayon = "1.6.1"
+thiserror = "1.0.38"
 
 [dev-dependencies]
 criterion = "0.4.0"

Cargo.toml

@@ -2,7 +2,7 @@
 
 ---
 
-[<img alt="GitHub Workflow Status" src="https://img.shields.io/github/workflow/status/yamafaktory/hypergraph/ci?style=for-the-badge">](https://github.com/yamafaktory/hypergraph/actions/workflows/ci.yml) [<img alt="Crates.io" src="https://img.shields.io/crates/v/hypergraph?style=for-the-badge">](https://crates.io/crates/hypergraph/versions?sort=semver) [<img alt="docs.rs" src="https://img.shields.io/docsrs/hypergraph?style=for-the-badge">](https://docs.rs/hypergraph)
+[<img alt="GitHub Workflow Status" src="https://img.shields.io/github/actions/workflow/status/yamafaktory/hypergraph/ci.yml?branch=main&logo=github&style=flat-square">](https://github.com/yamafaktory/hypergraph/actions/workflows/ci.yml) [<img alt="Crates.io" src="https://img.shields.io/crates/v/hypergraph?style=for-the-badge">](https://crates.io/crates/hypergraph/versions?sort=semver) [<img alt="docs.rs" src="https://img.shields.io/docsrs/hypergraph?style=for-the-badge">](https://docs.rs/hypergraph)
 
 Hypergraph is a data structure library to generate **directed** [hypergraphs](https://en.wikipedia.org/wiki/Hypergraph).