TypeError: str expected, not int

[aluciffer]

Hi,

I get this 'str expected, not int' error that gets traced back to :

File "...\aws_lambda\aws_lambda.py", line 217, in invoke
    os.environ[key] = get_environment_variable_value(value)

This is because i have configured an int variable in my config.yaml, i.e.:
repeat: 100

Would it be good to wrap get_environment_variable_value in str() ?

[urandu]

I think It would be good to wrap it in a str() like its done at this point

python-lambda/aws_lambda/aws_lambda.py

Line 662 in aad2dad

key: str(get_environment_variable_value(value))

[urandu]

Here is the PR #270