[node] simpler PACKAGE_JSON_VERSION

package.json

@@ -28,7 +28,6 @@
     "aws-sdk": "^2.2.19",
     "mapbox-gl-test-suite": "mapbox/mapbox-gl-test-suite#744b63be01e36c75c6e629aec16a53048c0b7dbc",
     "node-gyp": "^3.2.0",
-    "read-package-json": "^2.0.2",
     "request": "^2.67.0",
     "tape": "^4.2.2"
   },

scripts/node/after_script.sh

@@ -11,7 +11,7 @@ else
 fi
 
 COMMIT_MESSAGE=$(git show -s --format=%B $TRAVIS_COMMIT | tr -d '\n')
-PACKAGE_JSON_VERSION=$(node ./scripts/node/package-version.js)
+PACKAGE_JSON_VERSION=$(node -e "console.log(require('./package.json').version)")
 
 if [[ ${TRAVIS_TAG} == node-v${PACKAGE_JSON_VERSION} ]] || test "${COMMIT_MESSAGE#*'[publish binary]'}" != "$COMMIT_MESSAGE"; then
     source ~/.nvm/nvm.sh

scripts/node/package-version.js

@@ -1,6 +0,0 @@
-var readJSON = require('read-package-json');
-
-readJSON('package.json', function(err, data) {
-    if (err) process.stderr.write(err);
-    process.stdout.write(data.version);
-});