Merge pull request #7 from evanread/add-mdspell

Add support for MDSpell and Yarn.

.travis.yml

@@ -14,6 +14,7 @@ script:
   - docker run testimage python --version
   - docker run testimage pip list --format columns
   - docker run testimage aws --version
+  - docker run testimage yarn --version
 
 notifications:
   slack:

Dockerfile

@@ -25,4 +25,4 @@ RUN apk update --no-cache && apk --no-cache add \
       python-markdown-math \
 # Set registry, authentication token can be set at runtime.
     && npm set registry "http://registry.npmjs.org" \
-    && npm install -g markdownlint-cli write-good && npm cache clean
+    && npm install -g markdownlint-cli write-good yarn markdown-spellcheck && npm cache clean

README.md

@@ -12,7 +12,12 @@ This project contains the Docker file required to build the documentation platfo
 - [Node](https://nodejs.org/en/)
 - [Python](https://www.python.org)
 - [Pip](https://pypi.python.org/pypi)
-- [AWS CLI](https://aws.amazon.com/cli/).
+- [AWS CLI](https://aws.amazon.com/cli/)
+- NPM packages:
+    - [Yarn](https://www.npmjs.com/package/yarn)
+    - [`markdownlint-cli`](https://www.npmjs.com/package/markdownlint-cli)
+    - [`write-good`](https://www.npmjs.com/package/write-good)
+    - [`markdown-spellcheck`](https://www.npmjs.com/package/markdown-spellcheck).
 
 ## Prerequisites
 
@@ -35,7 +40,7 @@ docker build -t {imagename} --build-arg SOURCE_COMMIT=$(git rev-parse --short HE
 
 To log in to the previously built Docker image, run:
 
-```
+```sh
 docker run -ti {imagename} sh
 ```