Bump iOS minimum deployment target (lyft#169)

With Xcode 12 the minimum supported version is iOS 9 and it produces a
warning if you're lower than that.

Mapper.xcodeproj/project.pbxproj

@@ -292,7 +292,7 @@
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1;
 				DEBUG_INFORMATION_FORMAT = dwarf;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				ONLY_ACTIVE_ARCH = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
 				SWIFT_VERSION = 3.0;
@@ -308,7 +308,7 @@
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				SWIFT_VERSION = 3.0;
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
@@ -326,7 +326,6 @@
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INFOPLIST_FILE = Resources/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				PRODUCT_BUNDLE_IDENTIFIER = com.Lyft.Mapper;
 				PRODUCT_NAME = Mapper;
@@ -348,7 +347,6 @@
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INFOPLIST_FILE = Resources/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				PRODUCT_BUNDLE_IDENTIFIER = com.Lyft.Mapper;
 				PRODUCT_NAME = Mapper;

ModelMapper.podspec

@@ -5,7 +5,7 @@ Pod::Spec.new do |s|
   s.homepage                  = "https://github.com/lyft/mapper"
   s.license                   = "Apache License, Version 2.0"
   s.author                    = { "Keith Smiley" => "[email protected]" }
-  s.ios.deployment_target     = "8.0"
+  s.ios.deployment_target     = "9.0"
   s.osx.deployment_target     = "10.10"
   s.tvos.deployment_target    = "9.0"
   s.watchos.deployment_target = "2.0"