Fix `BalancerErrors` compiler range

[jubeira]

Description

BalancerErrors doesn't actually compile with 0.7.0. We need the first feature listed in the release notes for 0.7.1.

Another option would be not using "free functions", but at this point I think it's just not worth it.

Type of change

• [x] Bug fix
• [ ] New feature
• [ ] Breaking change
• [ ] Dependency changes
• [ ] Code refactor / cleanup
• [ ] Documentation or wording changes
• [ ] Other

Checklist:

• [x] The diff is legible and has no extraneous changes
• N/A - Complex code has been commented, including external interfaces
• N/A - Tests are included for all code paths
• [x] The base branch is either master, or there's a description of how to merge

Issue Resolution

N/A

[jubeira]

Probably nobody is using exactly 0.7.0, which is why we never encountered this, and maybe this is overkill: but it's not wrong to fix it.

Here's how I realized :) https://github.com/publu/qidao_gov/pull/1

[jubeira]

Thanks for remembering the changelog - I'm not sure we always do that.

We'll do one more pass over it before the next npm release.