chore: fix spelling

Merge mruby 3.0.0

Fix load 64-bit integer from mrb format; fix #5369

Update minimal build configuration [ci skip]

Remove unused `mrblib/init_mrblib.c`

feat: add pre-commit framework

The size and signedness of `mrb_int` and `time_t` may differ.

Support libedit on mirb for FreeBSD

Fixes C++03 compilation.

Binding

e.g. `def ==(v) = true`. The issue is reported by @shuujii

- prohibit defining setter method
- allow endless def without parentheses

Bump actions/setup-node from v2.1.4 to v2.1.5

Bumps [actions/setup-node](https://github.com/actions/setup-node) from v2.1.4 to v2.1.5.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](https://github.com/actions/setup-node/compare/v2.1.4...46071b5c7a2e0c34e49c3cb8a0e792e86e18d5ea)
Signed-off-by: dependabot[bot] <support@github.com>