linter: add markdown-link-check to check links whether alive

Signed-off-by: Allen Sun <[email protected]>

.circleci/config.yml

@@ -7,14 +7,18 @@ jobs:
     docker:
       # this image is build from Dockerfile 
       # https://github.com/pouchcontainer/pouchlinter/blob/master/Dockerfile
-      - image: pouchcontainer/pouchlinter:v0.1
+      - image: pouchcontainer/pouchlinter:v0.1.1
     working_directory: /go/src/github.com/alibaba/pouch
     steps:
       - checkout
       - run:
           name: use markdownlint v0.5.0 to lint markdown file (https://github.com/markdownlint/markdownlint)
           command: |
             find  ./ -name  "*.md" | grep -v vendor | grep -v commandline |  grep -v .github |  grep -v swagger |  grep -v api |  xargs mdl -r ~MD010,~MD013,~MD024,~MD029,~MD033,~MD036
+      - run:
+          name: use markdown-link-check(https://github.com/tcort/markdown-link-check) to check links in markdown files
+          command: |
+             for name in $(find . -name \*.md | grep -v vendor | grep -v CHANGELOG); code=1; if [ $code -ne 0 ]; then exitCode=1; fi; done; if [ $exitCode -ne 0 ]; then echo error | grep noerror; fi
       - run:
           name: use opensource tool client9/misspell to correct commonly misspelled English words 
           command: |
@@ -26,20 +30,18 @@ jobs:
 
   code-check:
     docker: 
-      - image: pouchcontainer/pouchlinter:v0.1
+      - image: pouchcontainer/pouchlinter:v0.1.1
     working_directory: /go/src/github.com/alibaba/pouch
     steps:
       - checkout
       - run: 
           name: validate swagger.yml
           command: |
-            swagger validate "/go/src/github.com/alibaba/pouch/apis/swagger.yml"
-            
+            swagger validate "/go/src/github.com/alibaba/pouch/apis/swagger.yml" 
       - run: 
           name: validate go code with gometalinter
           command: |
             gometalinter --disable-all --skip vendor -E gofmt -E goimports -E golint -E ineffassign -E misspell -E vet -E megacheck ./...
-      
       - run:
           name: detect deadcode without test folder
           command: |