Ignore spell-check in code chunks

[tgrrr]

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Description

Add option to ignore spell-check within code-blocks

Steps to Reproduce

1. Create markdown document
2. Add codeblock with

// code goes here

Expected behavior:

Spell-check ignores those words

Actual behavior:

Spell-check highlights words in code-block

Reproduces how often:

100%

Versions

spell-check 0.74.5
Atom : 1.38.2
Electron: 2.0.18
Chrome : 61.0.3163.100
Node : 8.9.3

apm 2.1.7
npm 6.2.0
node 8.9.3 x64
atom 1.38.2
python 3.6.4
git 2.21.0

Mac Mojave 10.14.5

Additional Information

I understand that if the language is loaded in atom (ie. language-latex), then that should allow it to be ignored. However, there should be an option to ignore this without loading other language packs.

[rsese]

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