Remove "artisan command" that"s not working anyway

Merge pull request #165 from jdavidbakr/master

Changing "getenv()" to "env()" in the sample config file

Merge pull request #156 from derekmd/update-docblock

Update docblock for twilio/sdk 5.*

Merge pull request #152 from sergio-agosti/master

Fix use of $params in facade message method

Merge pull request #149 from reedmaniac/4.x

Twilio 4.x

Merge pull request #138 from cbj4074/patch-1

Re-add upper bound on twilio/sdk version constraint

Remove upper limit of twilio dependency. Way too instable.