chore: switch to shelljs-changelog

package.json

@@ -12,7 +12,6 @@
     "prebuild": "rimraf lib",
     "build": "babel src -d lib",
     "build:watch": "npm run build -- -w",
-    "changelog": "bash scripts/changelog.sh",
     "dev": "concurrently -rk 'npm run build:watch' 'npm run lint:watch'",
     "lint": "eslint .",
     "lint:fix": "npm run lint --silent -- --fix",
@@ -22,6 +21,7 @@
     "release:major": "shelljs-release major",
     "release:minor": "shelljs-release minor",
     "release:patch": "shelljs-release patch",
+    "changelog": "shelljs-changelog",
     "test": "nyc --reporter=text --reporter=lcov mocha",
     "test:watch": "concurrently -rk 'npm run test --silent -- -w' 'npm run lint:watch'"
   },
@@ -63,6 +63,7 @@
     "mocha": "^2.4.5",
     "nyc": "^6.4.0",
     "rimraf": "^2.5.2",
+    "shelljs-changelog": "^0.2.0",
     "shelljs-release": "^0.2.0",
     "sinon": "^1.17.3",
     "sinon-chai": "^2.8.0",