Update Xcode 9.2 recommended settings

Examples/Example-iOS/Example-iOS.xcodeproj/xcshareddata/xcschemes/Example-iOS.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "0920"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

Lib/KeychainAccess.xcodeproj/project.pbxproj

@@ -267,7 +267,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0730;
-				LastUpgradeCheck = 0900;
+				LastUpgradeCheck = 0920;
 				ORGANIZATIONNAME = "kishikawa katsumi";
 				TargetAttributes = {
 					140F195B1A49D79400B0016A = {

Lib/KeychainAccess.xcodeproj/xcshareddata/xcschemes/KeychainAccess.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "0920"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

Lib/KeychainAccess.xcodeproj/xcshareddata/xcschemes/TestHost.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "0920"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"