Update gatsby-remark-autolink-headers in /docs from 1.4.13 to 1.4.15

[dependencies]

Dependencies.io has updated gatsby-remark-autolink-headers (a npm dependency in /docs) from "1.4.13" to "1.4.15".

1.4.15

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1.4.14

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[codecov]

Codecov Report

Merging #3314 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3314   +/-   ##
=======================================
  Coverage   35.63%   35.63%           
=======================================
  Files         472      472           
  Lines       10121    10121           
  Branches      930      953   +23     
=======================================
  Hits         3607     3607           
+ Misses       5940     5904   -36     
- Partials      574      610   +36

Impacted Files	Coverage Δ
app/mithril/src/server/utils.js	0% <0%> (-100%)	⬇️
addons/actions/src/lib/decycle.js	53.52% <0%> (ø)	⬆️
addons/info/src/components/types/PrettyPropType.js	85.71% <0%> (ø)	⬆️
addons/storyshots/src/vue/renderTree.js	60% <0%> (ø)	⬆️
addons/info/src/components/types/Enum.js	0% <0%> (ø)	⬆️
lib/ui/src/modules/ui/components/shortcuts_help.js	12.85% <0%> (ø)	⬆️
addons/knobs/src/components/types/Number.js	7.46% <0%> (ø)	⬆️
...ddons/actions/src/containers/ActionLogger/index.js	0% <0%> (ø)	⬆️
lib/components/src/table/cell.js	65.21% <0%> (ø)	⬆️
addons/viewport/src/manager/components/Panel.js	37.1% <0%> (ø)	⬆️
... and 59 more

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