```ruby
class RstudioPreview < Cask
  url 'https://s3.amazonaws.com/rstudio-dailybuilds/RStudio-0.98.806.dmg'
  homepage 'http://www.rstudio.com/ide/download/preview'
  version '0.98.806'
  sha256 'a6a20ef021c10d395aeeb1057a69d8da9e349a7aa9b6a9e44df76767299b22a5'
  link 'RStudio.app'
end
```

Update RStudio preview to version 0.98.932
user
```ruby
class RstudioPreview < Cask
  url 'https://s3.amazonaws.com/rstudio-dailybuilds/RStudio-0.98.932.dmg'
  homepage 'http://www.rstudio.com/ide/download/preview'
  version '0.98.932'
  sha256 'ca652a4afd70eeb6cc7d5a016312ba535f0a000f97deec6e2367503045666c1e'
  link 'RStudio.app'
end
```
assistant