title: intero-goto-definition doesn't include libraries?
body: <p>I am trying to use <code>M-.</code> to go to the definition of a function, but it seems like <code>intero-goto-definition</code> only works the library I am currently developing, not on ones that I am importing.</p>
  
  <p>Here is my stack.yaml:</p>
  
  <pre><code>flags: {}
  extra-package-dbs: []
  packages:
  - location: libs/not-gloss/not-gloss # the library I am trying to C-. into
  - .
  extra-deps:
  - spatial-math-0.4.0.0
  resolver: lts-9.0
  </code></pre>