Update jest and babel dependencies, simplify babel setup

Author: adamwathan

package.json

@@ -24,13 +24,11 @@
     "test": "jest && eslint ."
   },
   "devDependencies": {
-    "babel-cli": "^6.6.5",
-    "babel-core": "^6.7.2",
-    "babel-jest": "^23.6.0",
-    "babel-preset-env": "^1.0.0",
-    "babel-preset-react": "^6.24.1",
-    "babel-preset-stage-2": "^6.24.1",
-    "babel-preset-stage-3": "^6.24.1",
+    "@babel/cli": "^7.0.0",
+    "@babel/core": "^7.0.0",
+    "@babel/node": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
+    "babel-jest": "^23.4.2",
     "clean-css": "^4.1.9",
     "eslint": "^5.15.1",
     "eslint-config-postcss": "^2.0.2",
@@ -63,20 +61,19 @@
   "babel": {
     "presets": [
       [
-        "env",
+        "@babel/preset-env",
         {
           "targets": {
             "node": "6.9.0"
           }
         }
-      ],
-      "stage-2",
-      "stage-3",
-      "react"
+      ]
     ]
   },
   "jest": {
-    "setupTestFrameworkScriptFile": "<rootDir>/jest/customMatchers.js",
+    "setupFilesAfterEnv": [
+      "<rootDir>/jest/customMatchers.js"
+    ],
     "testPathIgnorePatterns": [
       "<rootDir>/__tests__/fixtures/"
     ]