ES2021 digit separator trivia

Update releases.yaml, add braces for goto.

releases/releases.yaml

@@ -1396,3 +1396,4 @@ duktape_releases:
     - "Fix JSON.stringify() handling of Array 'replacer' duplicates (e.g. JSON.stringify({foo: 123}, [\"foo\", \"foo\"])); previously incorrectly serialized multiple times, now only once (GH-2379)"
     - "Add support for DJGPP (MSDOS) platform (GH-2472, GH-2473)"
     - "Remove .caller and .arguments own properties from both strict and non-strict function objects, and add .caller and .arguments throwers to Function.prototype to match ES2015+ (GH-2482)"
+    - "Add support for ES2021 digit separator (GH-2537)"

src-input/duk_lexer.c

@@ -1715,8 +1715,12 @@ slow_path:
 				}
 				last_was_digit = 0;
 			} else if (x == DUK_ASC_UNDERSCORE) {
-				if (!last_was_digit) goto fail_number_literal;
-				if (s2n_radix != 16 ? !DUK__ISDIGIT(DUK__L1()) : !DUK__ISHEXDIGIT(DUK__L1())) goto fail_number_literal;
+				if (!last_was_digit) {
+					goto fail_number_literal;
+				}
+				if (s2n_radix != 16 ? !DUK__ISDIGIT(DUK__L1()) : !DUK__ISHEXDIGIT(DUK__L1())) {
+					goto fail_number_literal;
+				}
 				DUK__ADVANCECHARS(lex_ctx, 1);
 				last_was_digit = 0;
 				continue;