updated support for laravel 9 LTS

Merge pull request #18 from msonowal/analysis-wjZmeE

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Merge pull request #7 from msonowal/analysis-876RpZ

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treatment to isUnderBillingCycle() to check pass with is active also

reusing onTrial for negating isUnderBillingCycle method

added new method subscribedWithinBillingCycle to determine whether a …

…user is under billing cycle activate not trial its boolean that will return

Merge pull request #5 from msonowal/analysis-XVxE9P

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Merge pull request #4 from msonowal/analysis-8P7yno

Added support for start_at timestamp which makes the subscription to start at later date
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Merge pull request #3 from msonowal/analysis

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Update LICENSE.txt