Merge pull request #54 from sighupio/feature/upgrade-guide-to-v-1-11-0

feat(docs): add v1.10 to v1.11 upgrade guide

docs/upgrades/v1.10-to-v1.11.0.md

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+# Upgrade from v1.10.x to v1.11.0
+
+In this release we introduced support for choosing containerd for Kubernetes < 1.24, and updated the version of the AWS provider to v17.
+
+Upgrading from the previous version requires running the following commands for both the `vpc-and-vpn` and `eks` modules:
+
+1. `terraform init -upgrade`
+2. `terraform plan`
+3. `terraform apply -refresh-only`
+
+The expected changes when upgrading are:
+
+1. `terraform plan` sees some external changes because of [the `tags_all` introduced in 3.38.0](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/guides/resource-tagging#propagating-tags-to-all-resources) that allows setting tags at the provider level and will be inherited by all the rest and other new attributes that weren't managed by terraform before.
+2. [The private endpoint security group rule has been renamed to allow the use of CIDR blocks and Security Groups as source](https://github.com/terraform-aws-modules/terraform-aws-eks/blob/master/CHANGELOG.md#v1700---2021-05-28). The existing security group rule will be destroyed and an equivalent one will be created.
+3. launch templates get a new attribute "version" changed in place.