experimental tvOS podspec support

FMDB.podspec

@@ -10,6 +10,7 @@ Pod::Spec.new do |s|
   s.ios.deployment_target = '11.0'
   s.osx.deployment_target = '10.13'
   s.watchos.deployment_target = '7.0'
+  s.tvos.deployment_target = '16.0'
   s.default_subspec = 'standard'
 
   # use the built-in library version of sqlite3