chore: update to babel 7.0.0-beta.54 (#887)

Author: christophehurpeau

package.json

@@ -19,9 +19,9 @@
     "watch": "gulp watch"
   },
   "devDependencies": {
-    "@babel/core": "^7.0.0-beta.49",
-    "@babel/plugin-transform-block-scoping": "^7.0.0-beta.49",
-    "@babel/preset-env": "^7.0.0-beta.49",
+    "@babel/core": "^7.0.0-beta.54",
+    "@babel/plugin-transform-block-scoping": "^7.0.0-beta.54",
+    "@babel/preset-env": "^7.0.0-beta.54",
     "babel-core": "^7.0.0-bridge.0",
     "babel-jest": "^22.4.3",
     "butternut": "^0.4.6",

packages/babel-minify/package.json

@@ -18,7 +18,7 @@
   },
   "repository": "https://github.com/babel/minify/tree/master/packages/babel-minify",
   "dependencies": {
-    "@babel/core": "^7.0.0-beta.49",
+    "@babel/core": "^7.0.0-beta.54",
     "babel-preset-minify": "^0.4.3",
     "fs-readdir-recursive": "^1.1.0",
     "lodash.pick": "^4.4.0",

packages/gulp-babel-minify/package.json

@@ -13,7 +13,7 @@
   "main": "lib/index.js",
   "repository": "https://github.com/babel/minify/tree/master/packages/gulp-babel-minify",
   "dependencies": {
-    "@babel/core": "7.0.0-beta.49",
+    "@babel/core": "7.0.0-beta.54",
     "babel-preset-minify": "^0.4.3",
     "plugin-error": "^1.0.1",
     "through2": "^2.0.3",