Removing async from `task()`

[yashshah1]

https://github.com/covid19india/api/blob/7c1f7f195a4519592c32f9a7b03638572b4ac218/lib/index.js#L23

in lib/index.js, the function task() is marked as async when it isn't actually asynchronous. You can choose to remove the async from the definition and await from all the subsequent calls, or convert it to an async function by using the async versions of the file i/o functions