[JSONStream] add stringify(false) overload

Package docs allow `false` as a parameter to `stringify`, in addition
  to `stringify(open, sep, close)`.  This is useful for dumping a stream
  of objects separated by newlines, rather than creating a JSON array of
  the objects.

  from https://www.npmjs.com/package/JSONStream

    > If you call JSONStream.stringify(false) the elements will only be
    > seperated by a newline.

types/jsonstream/index.d.ts

@@ -14,7 +14,25 @@ export interface Options {
 export declare function parse(pattern: any): NodeJS.ReadWriteStream;
 export declare function parse(patterns: any[]): NodeJS.ReadWriteStream;
 
+
+/**
+ * Create a writable stream.
+ * you may pass in custom open, close, and seperator strings. But, by default, 
+ * JSONStream.stringify() will create an array, 
+ * (with default options open='[\n', sep='\n,\n', close='\n]\n')
+ */
 export declare function stringify(): NodeJS.ReadWriteStream;
+
+/** If you call JSONStream.stringify(false) the elements will only be seperated by a newline. */
+export declare function stringify(newlineOnly: NewlineOnlyIndicator): NodeJS.ReadWriteStream;
+type NewlineOnlyIndicator = false
+
+/**
+ * Create a writable stream.
+ * you may pass in custom open, close, and seperator strings. But, by default, 
+ * JSONStream.stringify() will create an array, 
+ * (with default options open='[\n', sep='\n,\n', close='\n]\n')
+ */
 export declare function stringify(open: string, sep: string, close: string): NodeJS.ReadWriteStream;
 
 export declare function stringifyObject(): NodeJS.ReadWriteStream;

types/jsonstream/jsonstream-tests.ts

@@ -8,6 +8,7 @@ read = read.pipe(json.parse('*'));
 read = read.pipe(json.parse(['foo/*', 'bar/*']));
 
 read = json.stringify();
+read = json.stringify(false);
 read = json.stringify('{', ',', '}');
 
 read = json.stringifyObject();