disable demo project "png compress setting"

Demo/YYImageDemo.xcodeproj/project.pbxproj

@@ -434,6 +434,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				COMPRESS_PNG_FILES = NO;
 				FRAMEWORK_SEARCH_PATHS = "\"$(SRCROOT)/../Vendor\"";
 				INFOPLIST_FILE = YYImageDemo/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
@@ -448,6 +449,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				COMPRESS_PNG_FILES = NO;
 				FRAMEWORK_SEARCH_PATHS = "\"$(SRCROOT)/../Vendor\"";
 				INFOPLIST_FILE = YYImageDemo/Info.plist;
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;