Merge pull request #21 from fengzixu/master

feature: add the yamllint tool

Author: allencloud

CHANGELOG.md

@@ -8,3 +8,4 @@
 - Add [markdown-link-check](https://github.com/tcort/markdown-link-check) tool to check if links in markdown file is available;
 - Add [gometalinter](https://github.com/alecthomas/gometalinter) to validate golang code;
 - Add [go-swagger](https://github.com/go-swagger/go-swagger) to validate swagger yml for API;
+- Add [yamllint](https://github.com/adrienverge/yamllint) to validate yaml file;

Dockerfile

@@ -12,7 +12,7 @@ RUN curl -sL https://deb.nodesource.com/setup_8.x | bash -
 
 # shellcheck is included in this installation command.
 RUN apt-get update \
-    && apt-get install -y rubygems git curl wget shellcheck nodejs make gcc\
+    && apt-get install -y rubygems git curl wget shellcheck nodejs make gcc python-pip \
     && gem install rake \
     && gem install bundler \
     && apt-get clean   
@@ -51,3 +51,6 @@ RUN chmod +x /usr/local/bin/swagger
 
 # install misspell
 RUN curl -L https://git.io/misspell | bash
+
+# install yamllint
+RUN pip install --user yamllint && mv /root/.local/bin/yamllint /usr/bin