Fix `set` method

set should accept 'mixed' instead of 'string'

Fix

Fixes clearOldBackups method

Added methods to specify backup count and clear old backups

• setBackupCount($count)
• clearOldBackups()

Change vendor name

Namespacing changed from Raziul\DotEnvEditor to Digimax\DotEnvEditor

Initial release

Very first release 🚀