Fix: Renderers fail when processing range HTTP status code such as '2XX' (#397)

Both Markdown and Console renderer fail when trying to process a range HTTP status code, e. g. '2XX'. So any diff that results in an output including such a status code fails to render for markdown and console.
The error occurs when trying to parse the String HTTP status code into an Integer right here (both in Markdown and Console renderer):
```java
if (!code.equals("default")) {
     // Integer.parseInt(code) fails when passing e. g. '2XX'
    status = HttpStatus.getReasonPhrase(Integer.parseInt(code));
}
```
JSON and HTML renderer are not affected, since they do not try to display the 'reason phrase'. Everything else, the actual diff process etc. is also not affected.

# Expected behavior

Expected ranges of HTTP status codes, like '2XX' covering all codes between 200-299, to be treated like any other HTTP status code, since they have been part of the OpenAPI specification since version [3.0.0](https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.0.md#patterned-fields-1).

Author: TimoBehrendt

core/src/main/java/org/openapitools/openapidiff/core/output/ConsoleRender.java

@@ -118,7 +118,7 @@ private String ul_response(ChangedApiResponse changedApiResponse) {
   private String itemResponse(String title, String code) {
     StringBuilder sb = new StringBuilder();
     String status = "";
-    if (!code.equals("default")) {
+    if (!code.equals("default") && !code.matches("[1-5]XX")) {
       status = HttpStatus.getReasonPhrase(Integer.parseInt(code));
     }
     sb.append(StringUtils.repeat(' ', 4))

core/src/main/java/org/openapitools/openapidiff/core/output/MarkdownRender.java

@@ -158,7 +158,7 @@ protected String itemResponse(String code, ChangedResponse response) {
   protected String itemResponse(String title, String code, String description) {
     StringBuilder sb = new StringBuilder();
     String status = "";
-    if (!code.equals("default")) {
+    if (!code.equals("default") && !code.matches("[1-5]XX")) {
       status = HttpStatus.getReasonPhrase(Integer.parseInt(code));
     }
     sb.append(format("%s : **%s %s**\n", title, code, status));

core/src/test/java/org/openapitools/openapidiff/core/ConsoleRenderTest.java

@@ -14,4 +14,12 @@ public void renderDoesNotFailWhenPropertyHasBeenRemoved() {
         OpenApiCompare.fromLocations("missing_property_1.yaml", "missing_property_2.yaml");
     assertThat(render.render(diff)).isNotBlank();
   }
+
+  @Test
+  public void renderDoesNotFailWhenHTTPStatusCodeIsRange() {
+    ConsoleRender render = new ConsoleRender();
+    ChangedOpenApi diff =
+        OpenApiCompare.fromLocations("range_statuscode_1.yaml", "range_statuscode_2.yaml");
+    assertThat(render.render(diff)).isNotBlank();
+  }
 }

core/src/test/java/org/openapitools/openapidiff/core/MarkdownRenderTest.java

@@ -21,4 +21,12 @@ public void renderDoesNotCauseStackOverflowWithRecursiveDefinitions() {
     ChangedOpenApi diff = OpenApiCompare.fromLocations("recursive_old.yaml", "recursive_new.yaml");
     assertThat(render.render(diff)).isNotBlank();
   }
+
+  @Test
+  public void renderDoesNotFailWhenHTTPStatusCodeIsRange() {
+    MarkdownRender render = new MarkdownRender();
+    ChangedOpenApi diff =
+        OpenApiCompare.fromLocations("range_statuscode_1.yaml", "range_statuscode_2.yaml");
+    assertThat(render.render(diff)).isNotBlank();
+  }
 }

core/src/test/resources/range_statuscode_1.yaml

@@ -0,0 +1,10 @@
+openapi: 3.0.0
+info:
+  title: Projects API
+  version: 1.0.0
+paths:
+  /pet/:
+    get:
+      responses:
+        "405":
+          description: "Invalid input"

core/src/test/resources/range_statuscode_2.yaml

@@ -0,0 +1,10 @@
+openapi: 3.0.0
+info:
+  title: Projects API
+  version: 1.0.0
+paths:
+  /pet/:
+    get:
+      responses:
+        "4XX":
+          description: "Invalid input"