Compile against beta 48 (#8036)

package.json

@@ -10,19 +10,18 @@
     "test": "make test"
   },
   "devDependencies": {
-    "@babel/cli": "7.0.0-beta.46",
-    "@babel/core": "7.0.0-beta.46",
-    "@babel/plugin-transform-modules-commonjs": "7.0.0-beta.46",
-    "@babel/preset-env": "7.0.0-beta.46",
-    "@babel/preset-flow": "7.0.0-beta.46",
-    "@babel/preset-stage-0": "7.0.0-beta.46",
-    "@babel/register": "7.0.0-beta.46",
+    "@babel/cli": "7.0.0-beta.48",
+    "@babel/core": "7.0.0-beta.48",
+    "@babel/plugin-transform-modules-commonjs": "7.0.0-beta.48",
+    "@babel/preset-env": "7.0.0-beta.48",
+    "@babel/preset-flow": "7.0.0-beta.48",
+    "@babel/preset-stage-0": "7.0.0-beta.48",
+    "@babel/register": "7.0.0-beta.48",
     "babel-core": "^7.0.0-0",
     "babel-eslint": "^8.0.1",
     "babel-jest": "^22.4.1",
     "babel-loader": "8.0.0-beta.0",
     "babel-plugin-transform-charcodes": "^0.1.0",
-    "babylon": "7.0.0-beta.46",
     "browserify": "^13.1.1",
     "bundle-collapser": "^1.2.1",
     "chalk": "^2.3.2",