Update GOMEMLIMIT recommendation in readme #965
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https://go.dev/doc/gc-guide#:~:text=Do%20take%20advantage,is%20unaware%20of.
says:
We see in practice that memory can grow quickly, leading to OOMs.
Adjust the recommendation to 80%.
Links:
A related issue in k8s on setting the value to a percentage of memlimit: kubernetes/kubernetes#91514
https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/#how-pods-with-resource-limits-are-run
https://pkg.go.dev/runtime/debug#SetMemoryLimit