Use Babel 7 dependencies

.babelrc

@@ -3,7 +3,7 @@
     "compact": false,
     "presets": [
         [
-            "env",
+            "@babel/preset-env",
             {
                 "modules": false,
                 "targets": {

package.json

@@ -39,9 +39,9 @@
         "coverage": "nyc report --reporter=text-lcov | coveralls"
     },
     "devDependencies": {
-        "babel-core": "6.26.3",
+        "@babel/core": "7.0.0",
-        "babel-preset-env": "1.7.0",
+        "@babel/preset-env": "7.0.0",
-        "babelify": "8.0.0",
+        "babelify": "10.0.0-beta.1",
         "browserify": "16.2.2",
         "chai": "4.1.2",
         "chai-like": "1.1.1",