2.2.0

Changelog

d5b51b2 Merge pull request #18 from hiroebe/use-camel-case
66d4927 Merge pull request #19 from caioeverest/issue-14/add-set-considering-config-file
56029d4 Use camel case instead of snake case for variables
349b997 add environment variable check
fc6df32 add error to avoid program to continue if no token is defined
dc2903e create a separated function to decide which token reference will be used
d218f4c move token attribution to be performed after the configuration be loaded