v2.1.1 - fix crash on Android showing sign in

• fix(android, crash): call sign in with Apple service on UI thread (#196) 8cfdc59
• docs(CHANGELOG): prepare for 2.1.1 release 8e806d1
• chore(example): bump gradle to current stable 0fa36ac
• docs(README): add FAQ getting email etc from identity token (#183) eb6cfdf
• docs: update Error handling documentation for v2 (#180) 0cd5b8b
• Add Auth0 Information to README (#179) 732e317
• chore: update dependencies b3962c3
• docs(example, ios): fix incorrect import after type rearrangement aecbc67
• Update MIGRATION.md d39eefc

v2.1.0...v2.1.1