Change jsconfig.json "target" default value to "es2015"

[saschanaz]

• VSCode Version: 1.8.1
• OS Version: Windows 10

Steps to Reproduce:

1. Create a new empty jsconfig.json
2. Write compilerOptions and target
3. VSCode gives es6 by default whereas the name es2015 is now preferred

[mjbvz]

I'm going to move this issue over to schemastore, which is where we pick up the jsconfig.json schema. It should be as simple as updating this line: https://github.com/SchemaStore/schemastore/blob/master/src/schemas/json/jsconfig.json#L172

@saschanaz do you want to submit a PR against schemastore since you have more knowledge of this area?

Thanks

[mjbvz]

This issue was moved to SchemaStore/schemastore#262