chore: update all devDependencies to their latest versions

Replace all babel@6 modules by their babel@7 versions
Remove unused `babel-eslint` devDependency

Author: medfreeman

Diff for: package.json

@@ -23,22 +23,21 @@
     "uslug": "^1.0.4"
   },
   "devDependencies": {
-    "ava": "^0.17.0",
-    "babel-cli": "^6.4.0",
-    "babel-core": "^6.4.0",
-    "babel-eslint": "^10.0.1",
-    "babel-preset-es2015": "^6.3.13",
-    "babel-preset-stage-2": "^6.3.13",
-    "coveralls": "^2.11.9",
+    "@babel/cli": "^7.2.3",
+    "@babel/plugin-proposal-object-rest-spread": "^7.2.0",
+    "@babel/preset-env": "^7.2.3",
+    "@babel/register": "^7.0.0",
+    "ava": "^1.0.1",
+    "coveralls": "^3.0.2",
     "eslint": "^5.11.0",
     "eslint-config-i-am-meticulous": "^11.0.0",
     "eslint-plugin-import": "^2.2.0",
     "markdown-it": "^8.2.2",
-    "npmpub": "^3.1.0",
-    "nyc": "^10.0.0"
+    "npmpub": "^4.1.0",
+    "nyc": "^13.1.0"
   },
   "scripts": {
-    "prepublish": "babel --ignore __tests__ src --out-dir dist",
+    "prepublish": "babel src --ignore \"src/__tests__/**/*.js\" --out-dir dist --delete-dir-on-start",
     "lint": "eslint --ignore-path .gitignore --fix .",
     "tests": "ava",
     "pretest": "npm -s run lint",
@@ -49,8 +48,10 @@
   },
   "babel": {
     "presets": [
-      "es2015",
-      "stage-2"
+      "@babel/preset-env"
+    ],
+    "plugins": [
+      "@babel/plugin-proposal-object-rest-spread"
     ]
   },
   "eslintConfig": {
@@ -63,7 +64,7 @@
       "**/__tests__/*.js"
     ],
     "require": [
-      "babel-core/register"
+      "@babel/register"
     ]
   },
   "nyc": {