adding external link test with liche

.travis.yml

@@ -10,6 +10,7 @@ install:
   - "pip install -r tests-requirements.txt"
   - "pip install -r requirements.txt"
   - "npm install -g remark-cli remark-validate-links"
+  - "GO111MODULE=on go get -u github.com/raviqqe/liche"
 script:
   ./tests.sh
 after_success:

tests.sh

@@ -82,5 +82,18 @@ else
   remark -f -u validate-links *.md
 fi
 
+## test the doc with liche
+## https://github.com/raviqqe/liche/
+set +e
+which liche >/dev/null 2>&1
+r="$?"
+set -e
+if [ "$r" != "0" ]; then
+  echo "[WARNING] install \"liche\" to test the doc"
+else
+  liche -r -v docs
+  liche -v README.md
+fi
+
 ## done
 echo "All test finished successfully"