Update to babel 7.0.0-rc.1

We're (hopefully) getting closer to a 7.0.0 release for babel. Staying
up to date will probably make the final bump to the proper release
easier.

package.json

@@ -45,12 +45,12 @@
   },
   "homepage": "https://github.com/galooshi/import-js#readme",
   "devDependencies": {
-    "@babel/cli": "^7.0.0-beta.55",
-    "@babel/core": "^7.0.0-beta.55",
-    "@babel/plugin-proposal-class-properties": "^7.0.0-beta.55",
-    "@babel/plugin-transform-flow-strip-types": "^7.0.0-beta.55",
-    "@babel/preset-env": "^7.0.0-beta.55",
-    "@babel/preset-react": "^7.0.0-beta.55",
+    "@babel/cli": "^7.0.0-rc.1",
+    "@babel/core": "^7.0.0-rc.1",
+    "@babel/plugin-proposal-class-properties": "^7.0.0-rc.1",
+    "@babel/plugin-transform-flow-strip-types": "^7.0.0-rc.1",
+    "@babel/preset-env": "^7.0.0-rc.1",
+    "@babel/preset-react": "^7.0.0-rc.1",
     "babel-core": "^7.0.0-bridge.0",
     "babel-eslint": "^8.2.3",
     "babel-jest": "^23.0.1",
@@ -67,9 +67,9 @@
     "rimraf": "^2.6.2"
   },
   "dependencies": {
-    "@babel/parser": "^7.0.0-beta.55",
-    "@babel/plugin-syntax-flow": "^7.0.0-beta.55",
-    "@babel/plugin-syntax-typescript": "^7.0.0-beta.55",
+    "@babel/parser": "^7.0.0-rc.1",
+    "@babel/plugin-syntax-flow": "^7.0.0-rc.1",
+    "@babel/plugin-syntax-typescript": "^7.0.0-rc.1",
     "babel-plugin-jsx": "^1.2.0",
     "commander": "^2.11.0",
     "fb-watchman": "^2.0.0",