remove TODO since servlet 3.0 support is still needed.

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/zuul/filters/post/SendResponseFilter.java

@@ -72,8 +72,8 @@ public class SendResponseFilter extends ZuulFilter {
 	public SendResponseFilter() {
 		super();
 		// To support Servlet API 3.1 we need to check if setContentLengthLong exists
+		// minimum support in Spring 5 is 3.0 so we need to keep tihs
 		try {
-			//TODO: remove in 2.0
 			HttpServletResponse.class.getMethod("setContentLengthLong", long.class);
 		} catch(NoSuchMethodException e) {
 			useServlet31 = false;

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/zuul/filters/route/RibbonRoutingFilter.java

@@ -69,8 +69,8 @@ public class RibbonRoutingFilter extends ZuulFilter {
 		this.ribbonCommandFactory = ribbonCommandFactory;
 		this.requestCustomizers = requestCustomizers;
 		// To support Servlet API 3.1 we need to check if getContentLengthLong exists
+		// Spring 5 minimum support is 3.0, so this stays
 		try {
-			//TODO: remove in 2.0
 			HttpServletRequest.class.getMethod("getContentLengthLong");
 		} catch(NoSuchMethodException e) {
 			useServlet31 = false;