Documentation - Updating golang requirement to 1.11

[michal-franc]

When running

make test

golang 1.11 is required due to:

• strings.Builder in https://github.com/kubernetes/minikube/blob/master/pkg/util/utils_test.go#L169
  -- strings.Builder was introduced in go 1.10 https://golang.org/pkg/strings/#Builder
• gofmt 1.11 is required for gofmt formatting check step in tests

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: michal-franc
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[michal-franc]

cla requires a recheck - there is another PR done by me with cla being positive