This update for golang-github-google-jsonnet fixes the following issues:


Update to version v0.20.0:

  * Update cpp version (#687)
  * Add `std.round` function in standard library. (#683)
  * Implement std.isEmpty for string (#678)
  * Add std.xor for 2 booleans
  * Add support to return int based value from native functions golang implementations
  * Implement std.xor for booleans
  * feat: implement std.sum