Switch HSTS enum to upper case.

Since the RelaxedBinder now supports it.

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/SecurityProperties.java

@@ -121,7 +121,7 @@ public class SecurityProperties implements SecurityPrequisite {
 	public static class Headers {
 
 		public static enum HSTS {
-			none, domain, all
+			NONE, DOMAIN, ALL
 		}
 
 		private boolean xss;
@@ -132,7 +132,7 @@ public class SecurityProperties implements SecurityPrequisite {
 
 		private boolean contentType;
 
-		private HSTS hsts = HSTS.all;
+		private HSTS hsts = HSTS.ALL;
 
 		public boolean isXss() {
 			return this.xss;

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/SpringBootWebSecurityConfiguration.java

@@ -93,8 +93,8 @@ public class SpringBootWebSecurityConfiguration {
 
 	public static void configureHeaders(HeadersConfigurer<?> configurer,
 			SecurityProperties.Headers headers) throws Exception {
-		if (headers.getHsts() != Headers.HSTS.none) {
+		if (headers.getHsts() != Headers.HSTS.NONE) {
-			boolean includeSubdomains = headers.getHsts() == Headers.HSTS.all;
+			boolean includeSubdomains = headers.getHsts() == Headers.HSTS.ALL;
 			HstsHeaderWriter writer = new HstsHeaderWriter(includeSubdomains);
 			writer.setRequestMatcher(AnyRequestMatcher.INSTANCE);
 			configurer.addHeaderWriter(writer);