Schema version for config file

[JoshOrndorff]

The config file should have a field for schema version. When polkadot launch is run,it first checks the schema version to see if it knows how to interpret the config file. If not, fail with a reasonable error message. This will help users avoid confusion when they run an old version of polkadot launch with a new config file or vice versa.

[shawntabrizi]

the check file should basically do the same.

[JoshOrndorff]

What is the check file?

[shawntabrizi]

https://github.com/paritytech/polkadot-launch/blob/master/src/check.ts

[JoshOrndorff]

Oh nice. Didn't realize you had it already.