Fix Dotenv v3 usage

[mcaskill]

Fixed:

• Replaced occurrence of new Dotenv(…) with Dotenv::create(…)
• Loosened version constraint on vlucas/phpdotenv

Changed:

• Bumped version to 1.0.7

[junaidbhura]

Hey @mcaskill what is the benefit of using Dotenv::create vs new Dotenv ?

Have you tested this with Windows, Mac and Linux?

[mcaskill]

Because the API has changed:

V3 has changed the way you initialize the Dotenv class. Consequently, you will need to replace any occurrences of new Dotenv(…) with Dotenv::create(…), since our new native constructor takes a Loader instance now.

— Upgrading Guide, V2 to V3