gatsby-remark-images doesnt handle imageReferences in md files

[artbycrunk]

Description

When images are referenced in markdown files, remark images doesnt process them,
example syntax that doesnt work

[header]: header.jpg "Logo Title Text 2"

![alt text][header]

Expected result

Remark images should lookup the reference definition to find the image url and process it like a standard image.

Actual result

The reference image node is ignored.

Environment

System:
OS: Windows 10
CPU: (8) x64 Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz
Binaries:
Yarn: 1.13.0 - C:\Users\Savio\AppData\Roaming\npm\yarn.CMD
npm: 6.4.1 - C:\Program Files\nodejs\npm.CMD
Browsers:
Edge: 42.17134.1.0
npmPackages:
gatsby: 2.0.40 => 2.0.40
gatsby-image: 2.0.19 => 2.0.19
gatsby-plugin-catch-links: 2.0.6 => 2.0.6
gatsby-plugin-feed: 2.0.9 => 2.0.9
gatsby-plugin-google-analytics: 2.0.7 => 2.0.7
gatsby-plugin-lodash: 3.0.2 => 3.0.2
gatsby-plugin-manifest: 2.0.7 => 2.0.7
gatsby-plugin-nprogress: 2.0.6 => 2.0.6
gatsby-plugin-offline: 2.0.12 => 2.0.12
gatsby-plugin-react-helmet: 3.0.1 => 3.0.1
gatsby-plugin-sharp: ^2.0.17 => 2.0.17
gatsby-plugin-sitemap: 2.0.2 => 2.0.2
gatsby-plugin-twitter: 2.0.7 => 2.0.7
gatsby-remark-autolink-headers: 2.0.10 => 2.0.10
gatsby-remark-copy-linked-files: 2.0.6 => 2.0.6
gatsby-remark-images: 2.0.6 => 2.0.6
gatsby-remark-prismjs: 3.0.3 => 3.0.3
gatsby-remark-responsive-iframe: 2.0.6 => 2.0.6
gatsby-source-filesystem: 2.0.7 => 2.0.7
gatsby-transformer-remark: 2.1.11 => 2.1.11
gatsby-transformer-sharp: 2.1.8 => 2.1.8