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**Features and Improvements**
- first working version.
- add the ``sshec2 ssh``, interactive ssh command.
- add the following cli commands:
- ``sshec2 ssh``
- ``sshec2 info``
- ``sshec2 clear-cache``
- ``sshec2 config show``
- ``sshec2 config set-profile``
- ``sshec2 config set-region``
- ``sshec2 config set-cache-expire``