v2.0.0

• Almost complete rewrite in TypeScript
• Use PriorityQueue from typescript-collection
• O(log(n)) in all cases
• Switch to mocha and test CJS/ES6/TS
• Many bugs and edge cases fixed
• The preferred way to import is now via the named export but the default export is still there
• 2.0.0 can lead to a slightly different execution order when using different priorities, throttling and concurrency-limiting at the same time - the new order is the correct one