chores: update CI badge (#30)

Author: quagmt

.github/workflows/test.yaml

@@ -1,4 +1,4 @@
-name: Lint and Test
+name: Test
 
 on:
   pull_request:

README.md

@@ -1,6 +1,6 @@
 # udecimal
 
-[![build](https://github.com/quagmt/udecimal/actions/workflows/ci.yaml/badge.svg)](https://github.com/quagmt/udecimal/actions/workflows/ci.yaml)
+[![build](https://github.com/quagmt/udecimal/actions/workflows/test.yaml/badge.svg)](https://github.com/quagmt/udecimal/actions/workflows/test.yaml)
 [![Go Report Card](https://goreportcard.com/badge/github.com/quagmt/udecimal)](https://goreportcard.com/report/github.com/quagmt/udecimal)
 [![codecov](https://codecov.io/gh/quagmt/udecimal/graph/badge.svg?token=662ET843EZ)](https://codecov.io/gh/quagmt/udecimal)
 [![GoDoc](https://pkg.go.dev/badge/github.com/quagmt/udecimal)](https://pkg.go.dev/github.com/quagmt/udecimal)