introduce semantic versioning, add changelog

CHANGELOG.md

+# Changelog
+
+This document tracks all important changes to the Motion Bank Transcoding Service.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2018-12-04
+
+### Added
+
+- Changelog document
+
+### Changed
+
+- Start proper versioning at 1.0.0

package-lock.json

 {
   "name": "api",
-  "version": "0.0.1",
+  "version": "1.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

 {
   "name": "api",
-  "version": "0.0.1",
+  "version": "1.0.0",
   "description": "API server for Motion Bank Systems",
   "main": "src/index.js",
   "scripts": {