Update VERSION_HISTORY.md and MIGRATION_GUIDE.md

[oxisto]

Fixes #25

[oxisto]

@mfridman I think you had a suggesting for replacements before, would you mind adding that here? something like

go mod edit -replace github.com/dgrijalva/jwt-go=github.com/golang-jwt/[email protected]+incompatible

But will that work with our new import path? Or should we provide some sed-style replacement command?

Edit. I have just testing it with go mod edit -replace github.com/dgrijalva/jwt-go=github.com/golang-jwt/[email protected], which already has the new import path, works with problems

[mfridman]

lgtm. I see the backwards-compatibility was mentioned in the README so that's good enough.