Missing comma in gatsby-transformer-remark README

[martinlocklear]

In the "How to use" section there is an example of what you might put in your gatsby-config.js file. There is a missing comma at the end of the timeToRead value.

(First pull request, hope I'm doing this right.)

Description

This simply adds the comma to the end of the line in the README example.

Documentation

This is a documentation only change.

[AishaBlake]

Good catch, @martinlocklear! Welcome and thanks for contributing! If you're feeling unsure, be sure to check out the Contributing docs as well as our open issues.

[gatsbot]

Holy buckets, @martinlocklear — we just merged your PR to Gatsby! 💪💜

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