2.4.4

[alien190]

• [Android] BREAKING Future<List<ApphudPlacement>> placementsDidLoadCallback() renamed to Future<ApphudPlacements> fetchPlacements()
• [Android] paywallsDidLoadCallback call result contains optional ApphudError
• [Android] refreshUserData method was introduced
• [Android] ApphudError now contains networkIssue, billingResponseCode and billingErrorTitle attributes
• [iOS], [Android] ApphudPaywall now contains variationName and parentPaywallIdentifier attributes