(chore) - upgrade and simplify dev dependencies.

Author: beefancohen

.babelrc

@@ -1,7 +1,4 @@
 {
-  "presets": ["es2015"],
-  "plugins": [
-    "transform-object-rest-spread",
-    "transform-flow-strip-types",
-  ]
+  "presets": ["airbnb"],
+  "plugins": ["@babel/plugin-transform-flow-strip-types"]
 }

package.json

@@ -30,25 +30,21 @@
     "jest": "jest --coverage __tests__/**/*"
   },
   "devDependencies": {
-    "babel-cli": "^6.26.0",
-    "babel-core": "^6.26.3",
-    "babel-eslint": "^8.2.5",
-    "babel-jest": "^21.2.0",
-    "babel-plugin-transform-es2015-template-literals": "^6.22.0",
-    "babel-plugin-transform-flow-strip-types": "^6.22.0",
-    "babel-plugin-transform-object-rest-spread": "^6.26.0",
-    "babel-polyfill": "^6.26.0",
-    "babel-preset-es2015": "^6.24.1",
+    "@babel/core": "^7.0.0",
+    "@babel/plugin-transform-flow-strip-types": "^7.2.3",
+    "babel-eslint": "^10.0.1",
+    "babel-jest": "^24.0.0",
+    "babel-preset-airbnb": "^3.2.0",
     "coveralls": "^3.0.1",
-    "eslint": "^4.19.1",
+    "eslint": "^5.3.0",
     "eslint-config-airbnb-base": "^13.0.0",
-    "eslint-plugin-flowtype": "^2.49.3",
+    "eslint-plugin-flowtype": "^3.2.1",
     "eslint-plugin-import": "^2.13.0",
     "estraverse": "^4.2.0",
-    "expect": "^21.2.1",
+    "expect": "^24.0.0",
     "flow-bin": "^0.88.0",
     "in-publish": "^2.0.0",
-    "jest": "^21.2.1",
+    "jest": "^24.0.0",
     "jscodeshift": "^0.6.0",
     "minimist": "^1.2.0",
     "object.assign": "^4.1.0",