feat: Group flow declaration file under *.js of the same filename (#249)

Flow declaration should always have the same filename with `.flow` appended: https://flow.org/en/docs/declarations/

Author: CatChen

update.mjs

@@ -443,7 +443,7 @@ const base = {
   '*.fs': '$(capture).fs.js, $(capture).fs.js.map, $(capture).fs.jsx, $(capture).fs.ts, $(capture).fs.tsx, $(capture).fs.rs, $(capture).fs.php, $(capture).fs.dart',
   '*.go': '$(capture)_test.go',
   '*.java': '$(capture).class',
-  '*.js': '$(capture).js.map, $(capture).*.js, $(capture)_*.js, $(capture).d.ts',
+  '*.js': '$(capture).js.map, $(capture).*.js, $(capture)_*.js, $(capture).d.ts, $(capture).js.flow',
   '*.jsx': '$(capture).js, $(capture).*.jsx, $(capture)_*.js, $(capture)_*.jsx, $(capture).module.css, $(capture).less, $(capture).module.less, $(capture).module.less.d.ts, $(capture).scss, $(capture).module.scss, $(capture).module.scss.d.ts',
   '*.master': '$(capture).*.cs, $(capture).*.vb',
   '*.md': '$(capture).*',