lambda function gets enviroment variable name

[agustin320]

When calling invoke, if you try to get a env var (os.environ['host']) set in the config file like so:
host: $HOST it will print out $HOST instead of the actual value of the envar $HOST

[bob-codingdutchmen]

Note: the README indicates the correct usage is ${HOST}, but the result is the same for me: it just gets the name of the var

[bob-codingdutchmen]

I scrolled through the code, and it looks like the get_environment_variable_value function is only called when actually creating or updating a function on AWS lambda. It shouldn't be too hard to make a pull request for, but I'm not sure if I'll have the time soon.

[rishabh-bhargava]

Looks like this is solved with #87. Closing the issue.