Fix Powershell script and add support to connect via the EC2 instance name.#25

qoomon merged 3 commits intoqoomon:mainqoomon/aws-ssm-ssh-proxy-command:mainfrom

grossmane:bugfix/powershellScriptgrossmane/aws-ssm-ssh-proxy-command:bugfix/powershellScriptCopy head branch name to clipboard