[plugins.json] Add cocoapods-reopen

[dacaiguoguo]

Please add the following entry to the plugins.json file:

{
  "gem": "cocoapods-reopen",
  "name": "CocoaPods Reopen",
  "author": "dacaiguoguo",
  "url": "https://github.com/dacaiguoguo/cocoapods-reopen",
  "description": "a plugins close workspace or project and reopen it."
}