Add changes between releases on release notes

Changelog for 0.11.1:

• PR #179 release: add link that show the difference between releases by @cpanato

Commits
ede7834 update message for full changes when is the first release by @cpanato
3e7e02d update based on feedback by @cpanato
cf7d22e release: add link that show the difference between releases by @cpanato
761a288 Fix bug with PWD and terraform output by @alexellis
3850c30 Add Equinix Metal Terraform config by @alexellis
8d270dc Update GET.md by @alexellis

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