chore: bump version to 0.5

[sunng87]

Fixes #84

[piperRyan]

@sunng87 sorry for the review! Thanks for all the hard work getting this release out 🙂

[sunng87]

@piperRyan Thank you! I will push the release to crates.io today.

[sunng87]

@piperRyan I don't have permission to push tags, could you please create and push the v0.5.0 tag?

remote: error: GH013: Repository rule violations found for refs/tags/v0.5.0.
remote: Review all repository rules at https://github.com/piperRyan/rust-postgres-interval/rules?ref=refs%2Ftags%2Fv0.5.0
remote:
remote: - Cannot create ref due to creations being restricted.
remote:
To github.com:piperRyan/rust-postgres-interval.git
 ! [remote rejected] v0.5.0 -> v0.5.0 (push declined due to repository rule violations)
error: failed to push some refs to 'github.com:piperRyan/rust-postgres-interval.git'