Fixed test failure

Author: sagmalli

modules/swagger-parser-v3/src/test/java/io/swagger/v3/parser/test/OpenAPIV3ParserTest.java

@@ -1592,7 +1592,7 @@ public void testIssue915() {
     public void testIssue931() {
         ParseOptions options = new ParseOptions();
         options.setResolve(true);
-        SwaggerParseResult result = new OpenAPIV3Parser().readLocation("issue_931.json", null, options);
+        SwaggerParseResult result = new OpenAPIV3Parser().readLocation("Issue_931.json", null, options);
         assertNotNull(result.getOpenAPI());
         assertTrue(result.getMessages().size() > 0);
         assertEquals(result.getMessages().get(0).contains("doesn't adhere to regular expression ^[a-zA-Z0-9\\.\\-_]+$"), true);