try to improve the coverage report

Author: AlCalzone

.circleci/config.yml

@@ -124,12 +124,9 @@ jobs:
           name: Generate coverage report
           command: npm run coverage
 
-      - run: export COVERALLS_SERVICE_NAME="CircleCI"
-      - run: export COVERALLS_SERVICE_JOB_ID="$CIRCLE_BUILD_NUM"
-
       - run:
           name: Upload it to coveralls.io
-          command: npm run coveralls
+          command: COVERALLS_SERVICE_NAME="CircleCI" COVERALLS_SERVICE_JOB_ID="$CIRCLE_BUILD_NUM" npm run coveralls
 
 # ----------------------------------------------------
 # generates a clean build of the TypeScript sources