fix: fix the wrong var of gomips in README.md (#174)

README.md

@@ -62,7 +62,7 @@ jobs:
 | goarch | **Mandatory** | `GOARCH` is the running program's architecture target: one of `386`, `amd64`, `arm`, `arm64`, `s390x`, `loong64` and so on. |
 | goamd64 | **Optional** | `GOAMD64` is the running programs amd64 microarchitecture level, which is available since `go1.18`. It should only be used when `GOARCH` is `amd64`: one of `v1`, `v2`, `v3`, `v4`. |
 | goarm | **Optional** | `GOARM` is the running programs arm microarchitecture level, which is available since `go1.1`. It should only be used when `GOARCH` is `arm`: one of `5`, `6`, `7`. |
-| gomips | **Optional** | `GOMIPS` is the running programs arm microarchitecture level, which is available since `go1.13`. It should only be used when `GOARCH` is one of `mips`, `mipsle`, `mips64`, `mips64le`: one of `hardfloat`, `softfloat`. |
+| gomips | **Optional** | `GOMIPS` is the running programs arm microarchitecture level, which is available since `go1.13`. It should only be used when `GOMIPS` is one of `mips`, `mipsle`, `mips64`, `mips64le`: one of `hardfloat`, `softfloat`. |
 | goversion |  **Optional** | The `Go` compiler version. `latest`([check it here](https://go.dev/VERSION?m=text)) by default, optional `1.13`, `1.14`, `1.15`, `1.16`, `1.17`, `1.18`, `1.19`. You can also define a specific minor release, such as `1.19.5`. <br>Alternatively takes a download URL or a path to go.mod instead of version string. Make sure your URL references the `linux-amd64` package. You can find the URL on [Go - Downloads](https://go.dev/dl/).<br>e.g., `https://dl.google.com/go/go1.13.1.linux-amd64.tar.gz`. |
 | project_path | **Optional** | Where to run `go build`. <br>Use `.` by default. <br>If enable `multi_binaries: true`, you can use `project_path: ./cmd/...` or `project_path: ./cmd/app1 ./cmd/app2` to build multiple binaries and include them in one package.  |
 | binary_name | **Optional** | Specify another binary name if do not want to use repository basename. <br>Use your repository's basename if not set. |