update code for loading gem version dynamically

[markdboyd]

Changes proposed in this pull request:

• update code for loading gem version dynamically to address runtime error. As is, the plugin is failing to start with NoMethodError: undefined method version' for nil:NilClass`
• Remove Aws.eager_autoload! since it is deprecated in Ruby aws-sdk-core > 3

Things to check

• For any logging statements, is there any chance that they could be logging sensitive data?
• Are log statements using a logging library with a logging level set? Setting a logging level means that log statements "below" that level will not be written to the output. For example, if the logging level is set to INFO and debugging statements are written with log.debug or similar, then they won't be written to the otput, which can prevent unintentional leaks of sensitive data.

Security considerations

None, just changing method for loading gem version dynamically

[JasonTheMain]

Looks good to me