[Haskell-cafe] How to update a cabal dependency automatically

[ye yan]

I have been working on a haskell scotty project recently. I have just added 
configuration support for the project, which added an extra dependency of 
Control.Lens. My question is: is there a way update .cabal file 
automatically, just like cabal init but without recreate .cabal file?

Thanks in advance.
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