Add release script (#60)

Author: capripot

RELEASE.md

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+# Releasing a new version of checkr-official
+
+## Release process
+
+1. Create a list of all the changes since the prior release
+    1. Compare the latest release to master using
+       https://github.com/checkr/checkr-ruby/compare/`${latest}`...master
+    1. Open the linked pull requests from all the `Merge pull request #...` commits
+    1. For all non-documentation PRs, copy title (including pull request number)
+       into markdown list items
+    1. Sort into logical buckets, like "New", "Improvement", "Fix"
+    1. Reorganize to put the pull request number at the end of the line with author in parenthesis
+1. Ensure there are no breaking changes, or if there are breaking changes you'll need to bump
+   the major version, following [SemVer](https://semver.org/)
+1. Update the version
+    1. Update the constant in `lib/checkr/version.rb`
+    1. Commit and push to your branch
+    1. Get it reviewed and merge to master
+1. Move to master branch and pull last version
+1. Run the `bin/release` script to cut a release

bin/release

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+#!/usr/bin/env bash
+# Usage: bin/release
+# Build the gem, tag master, push it to origin, and then release the package on RubyGems.
+
+set -e
+
+branch="$(git rev-parse --abbrev-ref HEAD)"
+[ "$branch" = "master" ] ||
+  (echo "You are not on master. First push your branch, get your PR reviewed, merge it on Github. "\
+    "Then locally move to master and pull last changes." && exit 1)
+
+version="$(gem build *.gemspec | grep Version: | awk '{print $2}')"
+[ -n "$version" ] || (echo "Version needs to be a number" && exit 1)
+
+echo $version
+git tag "v$version"
+git push origin "v$version"
+gem push *-${version}.gem