correct size calculation

`yarn pack` does not output the file name like `npm pack` does. Correct this by explictly setting the filename.

circle.yml

@@ -573,8 +573,7 @@ jobs:
           working_directory: cli/build
       - run:
           name: list NPM package contents
-          working_directory: cli/build
-          command: yarn size
+          command: yarn lerna run --scope cypress size
       - run:
           name: pack NPM package
           working_directory: cli/build

cli/package.json

@@ -11,7 +11,7 @@
     "lint": "eslint --fix *.js scripts/*.js bin/* lib/*.js lib/**/*.js test/*.js test/**/*.js",
     "prerelease": "yarn build",
     "release": "cd build && releaser --no-node --no-changelog",
-    "size": "t=\"$(yarn pack)\"; wc -c \"${t}\"; tar tvf \"${t}\"; rm \"${t}\";",
+    "size": "t=\"cypress-v0.0.0.tgz\"; yarn pack --filename \"${t}\"; wc -c \"${t}\"; tar tvf \"${t}\"; rm \"${t}\";",
     "test": "yarn test-unit",
     "test-debug": "node --inspect --debug-brk $(yarn bin mocha)",
     "test-dependencies": "dependency-check . --no-dev",

packages/launcher/package.json

@@ -10,7 +10,7 @@
     "clean": "node scripts/clean.js || true",
     "clean-deps": "rm -rf node_modules",
     "clean-js": "yarn clean",
-    "size": "t=\"$(yarn pack)\"; wc -c \"${t}\"; tar tvf \"${t}\"; rm \"${t}\";",
+    "size": "t=\"cypress-v0.0.0.tgz\"; yarn pack --filename \"${t}\"; wc -c \"cli/${t}\"; tar tvf \"${t}\"; rm \"${t}\";",
     "test": "yarn test-unit",
     "test-unit": "mocha --reporter mocha-multi-reporters --reporter-options configFile=../../mocha-reporter-config.json"
   },