Change ios build project version.

ios/Runner.xcodeproj/project.pbxproj

@@ -357,7 +357,7 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_ENTITLEMENTS = Runner/Runner.entitlements;
-				CURRENT_PROJECT_VERSION = 20;
+				CURRENT_PROJECT_VERSION = 21;
 				DEVELOPMENT_TEAM = 32J6BB6VUS;
 				ENABLE_BITCODE = NO;
 				FRAMEWORK_SEARCH_PATHS = (
@@ -498,7 +498,7 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_ENTITLEMENTS = Runner/Runner.entitlements;
-				CURRENT_PROJECT_VERSION = 20;
+				CURRENT_PROJECT_VERSION = 21;
 				DEVELOPMENT_TEAM = 32J6BB6VUS;
 				ENABLE_BITCODE = NO;
 				FRAMEWORK_SEARCH_PATHS = (
@@ -533,7 +533,7 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CLANG_ENABLE_MODULES = YES;
 				CODE_SIGN_ENTITLEMENTS = Runner/Runner.entitlements;
-				CURRENT_PROJECT_VERSION = 20;
+				CURRENT_PROJECT_VERSION = 21;
 				DEVELOPMENT_TEAM = 32J6BB6VUS;
 				ENABLE_BITCODE = NO;
 				FRAMEWORK_SEARCH_PATHS = (