fix: use codecov bash uploader

This works in Travis CI windows because the build is run under git-bash.

Author: shazron

.travis.yml

@@ -18,7 +18,7 @@ script:
   - npm test
 
 after_success:
-- ./node_modules/.bin/codecov
+- bash <(curl -s https://codecov.io/bash)
 
 # safelist (prevent double builds in PRs)
 branches:

package.json

@@ -14,7 +14,6 @@
   "devDependencies": {
     "@adobe/eslint-config-aio-lib-config": "^1.2.0",
     "babel-runtime": "^6.26.0",
-    "codecov": "^3.5.0",
     "dotenv": "^8.1.0",
     "eol": "^0.9.1",
     "eslint": "^6.2.2",