Bump rails-observers from 0.1.2 to 0.1.5 (#1267)
Bump rails-observers from 0.1.2 to 0.1.5 (#1267)

Bumps [rails-observers](https://github.com/rails/rails-observers) from 0.1.2 to 0.1.5.
- [Release notes](https://github.com/rails/rails-observers/releases)
- [Commits](https://github.com/rails/rails-observers/compare/v0.1.2...v0.1.5)
tablexi/nucore-open,tablexi/nucore-open,tablexi/nucore-open,tablexi/nucore-open