Mention submodule in instructions (#820)

This prevents build failures when running tests for the `dhall` package
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Gabriel Gonzalez 2019-02-23 10:53:38 -08:00 committed by GitHub
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@ -55,6 +55,14 @@ with the pull request number for any of the above URLs.
## Building from source
For all of the following instructions, make sure to first check out the
`dhall-lang` submodule:
```bash
$ git submodule init
$ git submodule update
```
### [cabal](https://www.haskell.org/cabal)
You can build all of the packages by running: