Single quotes in value are not escaped properly

[wdegeus]

We just ran into an issue where we had some HTML in an environment variable which was quoted, so for example:
aws ssm put-parameter --name /my/path/HTML_BODY --value "'Lorem Ipsum<br><br>'" --type String

Now eval $(aws-env) breaks:
AWS_ENV_PATH=/my/path aws-env-linux-amd64 export HTML_BODY=$''Lorem Ipsum<br><br>''

eval $(AWS_ENV_PATH=/my/path aws-env-linux-amd64)
-bash: syntax error near unexpected token '<'

If aws-env would escape these we would not have a problem:

$ export HTML_BODY=$'\'Lorem Ipsum<br><br>\''
$ echo $HTML_BODY 
'Lorem Ipsum<br><br>'