use current path in node test container. otherwise the generated path…

…s in the lcov.info file do not match and render the lcov file invalid/incompatible

circle.yml

@@ -8,7 +8,7 @@ dependencies:
 
 test:
   override:
-    - docker run --rm -v $PWD:/src -w /src node:7 sh -c 'npm install; npm test'
+    - docker run --rm -v $PWD:$PWD -w $PWD node:7 sh -c 'npm install; npm test'
   post:
     - cp -r ./coverage/ $CIRCLE_ARTIFACTS
     - bash <(curl -s https://codecov.io/bash)