chore: transition dev dependencies to exact versions

Since the devDependencies are pinned in the package-lock.json anyways
there's no real use in leaving a version range open for the
devDependencies in package.json.

Instead, we simply keep our toolchain up-to-date with tools like ncu.

With this commit I also re-generate package-lock.json from scratch.

.npmrc

@@ -1,2 +1,2 @@
 tag-version-prefix="v"
-save-prefix="~"
+save-prefix=""

package.json

@@ -20,26 +20,26 @@
   "main": "index.js",
   "module": "esm-browser/index.js",
   "devDependencies": {
-    "@babel/cli": "~7.6.4",
-    "@babel/core": "~7.6.4",
-    "@babel/preset-env": "~7.6.3",
-    "@commitlint/cli": "~8.2.0",
-    "@commitlint/config-conventional": "~8.2.0",
-    "babel-eslint": "~10.0.3",
-    "babel-plugin-add-module-exports": "~1.0.2",
-    "browserstack-local": "~1.4.2",
-    "eslint": "~6.4.0",
-    "eslint-config-prettier": "~6.4.0",
-    "eslint-plugin-prettier": "~3.1.1",
-    "esm": "~3.2.25",
-    "http-server": "~0.12.0",
-    "husky": "~3.0.9",
-    "jest": "~24.9.0",
-    "lint-staged": "~9.4.3",
-    "npm-run-all": "~4.1.5",
-    "prettier": "~1.18.2",
+    "@babel/cli": "7.6.4",
+    "@babel/core": "7.6.4",
+    "@babel/preset-env": "7.6.3",
+    "@commitlint/cli": "8.2.0",
+    "@commitlint/config-conventional": "8.2.0",
+    "babel-eslint": "10.0.3",
+    "babel-plugin-add-module-exports": "1.0.2",
+    "browserstack-local": "1.4.4",
+    "eslint": "6.4.0",
+    "eslint-config-prettier": "6.4.0",
+    "eslint-plugin-prettier": "3.1.2",
+    "esm": "3.2.25",
+    "http-server": "0.12.1",
+    "husky": "3.0.9",
+    "jest": "24.9.0",
+    "lint-staged": "9.4.3",
+    "npm-run-all": "4.1.5",
+    "prettier": "1.18.2",
     "runmd": "1.2.1",
-    "selenium-webdriver": "~3.6.0",
+    "selenium-webdriver": "3.6.0",
     "standard-version": "7.0.0"
   },
   "scripts": {