fix(ios): base URL for AFHTTPSessionManager

[lekhmanrus]

Fix error for iOS:

ERROR Error: A security policy configured with `AFSSLPinningModeCertificate` can only be applied on a manager with a secure base URL (i.e. https)

So, now AFHTTPSessionManager reinitializes at enableSSLPinning with HttpsSSLPinningOptions.host base URL.

[lekhmanrus]

Hi @farfromrefug

Sorry, could that be merged?

Thanks! 🙂

[farfromrefug]

@lekhmanrus sorry I missed this. I ll mere this but won't release until September 4th as I am on holidays

[lekhmanrus]

Thanks @farfromrefug !