Fix warnings

Author: emmanue1

src/main/java/org/jd/core/v1/service/converter/classfiletojavasyntax/model/localvariable/Frame.java

@@ -26,7 +26,7 @@
 
 public class Frame {
     protected static final AbstractLocalVariableComparator ABSTRACT_LOCAL_VARIABLE_COMPARATOR = new AbstractLocalVariableComparator();
-    protected static final HashSet<String> CAPITALIZED_JAVA_LANGUAGE_KEYWORDS = new HashSet(Arrays.asList(
+    protected static final HashSet<String> CAPITALIZED_JAVA_LANGUAGE_KEYWORDS = new HashSet<>(Arrays.asList(
         "Abstract", "Continue", "For", "New", "Switch", "Assert", "Default", "Goto", "Package", "Synchronized",
         "Boolean", "Do", "If", "Private", "This", "Break", "Double", "Implements", "Protected", "Throw", "Byte", "Else",
         "Import", "Public", "Throws", "Case", "Enum", "Instanceof", "Return", "Transient", "Catch", "Extends", "Int",