DartClientCodegen reads dart-keywords.txt as resource, not file (#4484)

Author: roxspring

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartClientCodegen.java

@@ -107,7 +107,7 @@ public DartClientCodegen() {
 
         List<String> reservedWordsList = new ArrayList<String>();
         try {
-            BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("src/main/resources/dart/dart-keywords.txt"), Charset.forName("UTF-8")));
+            BufferedReader reader = new BufferedReader(new InputStreamReader(DartClientCodegen.class.getResourceAsStream("/dart/dart-keywords.txt"), Charset.forName("UTF-8")));
             while(reader.ready()) { reservedWordsList.add(reader.readLine()); }
             reader.close();
         } catch (Exception e) {