Update README.md to indicate go >= 1.20

```
go run build/ci.go install ./cmd/geth
[...]
# github.com/cockroachdb/pebble/vfs
../go/pkg/mod/github.com/cockroachdb/pebble@v0.0.0-20230928194634-aa077af62593/vfs/mem_fs.go:469:29: y.lockedFiles.Swap undefined (type sync.Map has no field or method Swap)
note: module requires Go 1.20
```
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henridf 2024-03-11 11:40:51 +01:00 committed by GitHub
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@ -16,7 +16,7 @@ archives are published at https://geth.ethereum.org/downloads/.
For prerequisites and detailed build instructions please read the [Installation Instructions](https://geth.ethereum.org/docs/getting-started/installing-geth). For prerequisites and detailed build instructions please read the [Installation Instructions](https://geth.ethereum.org/docs/getting-started/installing-geth).
Building `geth` requires both a Go (version 1.19 or later) and a C compiler. You can install Building `geth` requires both a Go (version 1.20 or later) and a C compiler. You can install
them using your favourite package manager. Once the dependencies are installed, run them using your favourite package manager. Once the dependencies are installed, run
```shell ```shell