⚒ fix codecov script (#28)

Author: mysticatea

package.json

@@ -23,7 +23,7 @@
     "@vuepress/plugin-last-updated": "^1.0.0-alpha.39",
     "@vuepress/plugin-pwa": "^1.0.0-alpha.39",
     "babel-eslint": "^10.0.1",
-    "codecov": "^3.0.1",
+    "codecov": "^3.3.0",
     "cross-spawn": "^6.0.5",
     "eslint": "^5.12.0",
     "eslint4b": "^5.12.0",
@@ -51,7 +51,7 @@
     "test:mocha": "mocha \"tests/lib/**/*.js\" --reporter dot --timeout 8000",
     "watch": "npm run -s test:mocha -- --watch --growl",
     "coverage": "nyc report --reporter lcov && opener coverage/lcov-report/index.html",
-    "codecov": "nyc report --reporter lcovonly && codecov --disable=gcov"
+    "codecov": "nyc report --reporter text-lcov | codecov --pipe --disable=gcov"
   },
   "repository": {
     "type": "git",