fix(docs): fixed Codecov link

Author: gfpcom

README.md

@@ -1,6 +1,6 @@
 # FreeProxy Go Client
 
-[![Go Reference](https://pkg.go.dev/badge/github.com/gfpcom/freeproxy-go)](https://pkg.go.dev/github.com/gfpcom/freeproxy-go) [![Release](https://img.shields.io/github/v/release/gfpcom/freeproxy-go?label=release&style=flat-square)](https://github.com/gfpcom/freeproxy-go/releases) [![Build Status](https://img.shields.io/github/actions/workflow/status/gfpcom/freeproxy-go/test.yml?workflow=Test&style=flat-square)](https://github.com/gfpcom/freeproxy-go/actions) [![Coverage](https://img.shields.io/github/actions/workflow/status/gfpcom/freeproxy-go/test.yml?label=coverage&style=flat-square)](https://github.com/gfpcom/freeproxy-go/actions) [![License](https://img.shields.io/github/license/gfpcom/freeproxy-go?style=flat-square)](https://github.com/gfpcom/freeproxy-go/blob/main/LICENSE) [![Go Version](https://img.shields.io/badge/go-1.25-blue?logo=go&style=flat-square)](https://pkg.go.dev/github.com/gfpcom/freeproxy-go)
+[![Go Reference](https://pkg.go.dev/badge/github.com/gfpcom/freeproxy-go)](https://pkg.go.dev/github.com/gfpcom/freeproxy-go) [![Release](https://img.shields.io/github/v/release/gfpcom/freeproxy-go?label=release&style=flat-square)](https://github.com/gfpcom/freeproxy-go/releases) [![Build Status](https://img.shields.io/github/actions/workflow/status/gfpcom/freeproxy-go/test.yml?workflow=Test&style=flat-square)](https://github.com/gfpcom/freeproxy-go/actions) [![Codecov](https://codecov.io/gh/gfpcom/freeproxy-go/branch/main/graph/badge.svg)](https://codecov.io/gh/gfpcom/freeproxy-go) [![License](https://img.shields.io/github/license/gfpcom/freeproxy-go?style=flat-square)](https://github.com/gfpcom/freeproxy-go/blob/main/LICENSE) [![Go Version](https://img.shields.io/badge/go-1.25-blue?logo=go&style=flat-square)](https://pkg.go.dev/github.com/gfpcom/freeproxy-go)
 
 A lightweight Go client library for the [GetFreeProxy API](https://developer.getfreeproxy.com).
 
@@ -27,7 +27,7 @@ go get github.com/gfpcom/freeproxy-go
 
 ### Get Your API Key
 
-First, obtain your API key from [GetFreeProxy](https://developer.getfreeproxy.com/docs).
+First, obtain your API key from [GetFreeProxy](https://developer.getfreeproxy.com/pricing).
 
 ### Basic Usage