chore(ci): upgrade node to 12 (#273)

* ci: upgrade node to 12

* chore(ci): update test coverage check

* chore: update ci

Author: kerm1it

.travis.yml

@@ -7,7 +7,7 @@ notifications:
   - yiminghe@gmail.com
 
 node_js:
-- 10
+- 12
 
 before_install:
 - |
@@ -16,12 +16,11 @@ before_install:
       echo "Only docs were updated, stopping build process."
       exit
     fi
-    npm install npm@3.x -g
-    phantomjs --version
 script:
 - |
     if [ "$TEST_TYPE" = test ]; then
-      npm test
+      npm test -- --coverage && \
+      bash <(curl -s https://codecov.io/bash)
     else
       npm run $TEST_TYPE
     fi