title: When I using `go install`, it returns not a main package
body: <p>I used <code>import &quot;github.com/go-redis/redis/v8&quot;</code> in my code. The environment is <code>go1.17.2 Windows AMD64</code>. I executed <code>go install github.com/go-redis/redis/v8@latest</code>, but the result is <code>package github.com/go-redis/redis/v8 is not a main package</code>. What's wrong of my operations or the config of environment. <code>go env GO111MODULE=on</code>.</p>
  <p>And when I execute <code>go run main.go</code>, it shows <code>cannot find package</code> at the line of import <code>github.com/go-redis/redis/v8</code>.</p>
  <p>Content in <code>go.mod</code>, (with simple <code>go mod init</code> &amp; <code>go mod tidy</code>):</p>
  <pre><code>module ...
  go 1.17
  
  require github.com/go-redis/redis/v8 v8.11.4
  
  require (
      github.com/cespare/xxhash/v2 v2.1.2 // indirect
      github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
  )
  </code></pre>