Bump `IPHONEOS_DEPLOYMENT_TARGET` to 9.0

For silence warning on `pod lib lint`

Base32.xcodeproj/Configs/Project.xcconfig

@@ -1,7 +1,7 @@
 PRODUCT_NAME = $(TARGET_NAME)
 SUPPORTED_PLATFORMS = macosx iphoneos iphonesimulator appletvos appletvsimulator watchos watchsimulator
 MACOSX_DEPLOYMENT_TARGET = 10.9
-IPHONEOS_DEPLOYMENT_TARGET = 8.0
+IPHONEOS_DEPLOYMENT_TARGET = 9.0
 TVOS_DEPLOYMENT_TARGET = 9.0
 WATCHOS_DEPLOYMENT_TARGET = 2.0
 DYLIB_INSTALL_NAME_BASE = @rpath

SwiftBase32.podspec

@@ -8,7 +8,7 @@ Pod::Spec.new do |s|
   s.author                    = { 'Norio Nomura' => 'norio.nomura@gmail.com' }
   s.source_files              = 'Sources/**/*.{h,c,swift}'
   s.pod_target_xcconfig       = { 'APPLICATION_EXTENSION_API_ONLY' => 'YES' }
-  s.ios.deployment_target     = '8.0'
+  s.ios.deployment_target     = '9.0'
   s.osx.deployment_target     = '10.9'
   s.tvos.deployment_target    = '9.0'
   s.watchos.deployment_target = '2.0'