JS: add change note for UselessConditional.ql

Author: asger-semmle

change-notes/1.19/analysis-javascript.md

@@ -60,6 +60,7 @@
 | Unused variable, import, function or class | Fewer false-positive results | This rule now flags fewer variables that may be used by `eval` calls. |
 | Unused variable, import, function or class | Fewer results | This rule now flags import statements with multiple unused imports once. |
 | Useless assignment to local variable | Fewer false-positive results | This rule now recognizes additional ways default values can be set. |
+| Useless conditional | More results, fewer false-positive results | This rule now recognizes conditionals in more cases, but no longer flags certain defensive coding patterns. |
 | Whitespace contradicts operator precedence | Fewer false-positive results | This rule no longer flags operators with asymmetric whitespace. |
 | Wrong use of 'this' for static method | More results, fewer false-positive results | This rule now recognizes inherited methods. |