Upgrade Babel to 7.0.0-beta.56 (#216)

Summary:
**Summary**

This pull request bumps Babel to 7.0.0-beta.56 to incorporate the latest bugfixes from Babel.

**Test plan**

One way to test is to add a simple TypeScript file with a type as the default export:

```typescript
export const test = 1
export default interface A {}
```

and then import that file from any other file:

```js
import { test } from './typescript-test'
```

Before this would throw an error, but with the latest Babel this is now fixed.
Pull Request resolved: facebook/metro#216

Reviewed By: mjesun

Differential Revision: D9216331

Pulled By: rafeca

fbshipit-source-id: a48e87c3c6b2902be410395b1b4afab63cb88fec

Author: LinusU

package.json

@@ -17,9 +17,9 @@
     "typecheck": "flow check"
   },
   "dependencies": {
-    "@babel/generator": "7.0.0-beta.54",
-    "@babel/parser": "7.0.0-beta.54",
-    "@babel/types": "7.0.0-beta.54",
+    "@babel/generator": "7.0.0-beta.56",
+    "@babel/parser": "7.0.0-beta.56",
+    "@babel/types": "7.0.0-beta.56",
     "babel-cli": "6.24.1",
     "babel-core": "6.25.0",
     "babel-eslint": "9.0.0-beta.2",

packages/relay-compiler/package.json

@@ -15,9 +15,9 @@
     "relay-compiler": "bin/relay-compiler"
   },
   "dependencies": {
-    "@babel/generator": "7.0.0-beta.54",
-    "@babel/parser": "7.0.0-beta.54",
-    "@babel/types": "7.0.0-beta.54",
+    "@babel/generator": "7.0.0-beta.56",
+    "@babel/parser": "7.0.0-beta.56",
+    "@babel/types": "7.0.0-beta.56",
     "babel-polyfill": "^6.20.0",
     "babel-preset-fbjs": "2.2.0",
     "babel-runtime": "^6.23.0",

yarn.lock

@@ -24,13 +24,13 @@
     source-map "^0.5.0"
     trim-right "^1.0.1"
 
-"@babel/[email protected].54":
-  version "7.0.0-beta.54"
-  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.0.0-beta.54.tgz#c043c7eebeebfd7e665d95c281a4aafc83d4e1c9"
+"@babel/[email protected].56":
+  version "7.0.0-beta.56"
+  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.0.0-beta.56.tgz#07d9c2f45990c453130e080eddcd252a9cbd8d66"
   dependencies:
-    "@babel/types" "7.0.0-beta.54"
+    "@babel/types" "7.0.0-beta.56"
     jsesc "^2.5.1"
-    lodash "^4.17.5"
+    lodash "^4.17.10"
     source-map "^0.5.0"
     trim-right "^1.0.1"
 
@@ -74,9 +74,9 @@
   version "7.0.0-beta.52"
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.0.0-beta.52.tgz#4e935b62cd9bf872bd37bcf1f63d82fe7b0237a2"
 
-"@babel/[email protected].54":
-  version "7.0.0-beta.54"
-  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.0.0-beta.54.tgz#c01aa63b57c9c8dce8744796c81d9df121f20db4"
+"@babel/[email protected].56":
+  version "7.0.0-beta.56"
+  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.0.0-beta.56.tgz#8638aa02e0130cd10b2ba4128e2b804112073ed3"
 
 "@babel/[email protected]":
   version "7.0.0-beta.52"
@@ -110,12 +110,12 @@
     lodash "^4.17.5"
     to-fast-properties "^2.0.0"
 
-"@babel/[email protected].54":
-  version "7.0.0-beta.54"
-  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.0.0-beta.54.tgz#025ad68492fed542c13f14c579a44c848e531063"
+"@babel/[email protected].56":
+  version "7.0.0-beta.56"
+  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.0.0-beta.56.tgz#df456947a82510ec30361971e566110d89489056"
   dependencies:
     esutils "^2.0.2"
-    lodash "^4.17.5"
+    lodash "^4.17.10"
     to-fast-properties "^2.0.0"
 
 "@mrmlnc/readdir-enhanced@^2.2.1":