Add release management

CHANGELOG.md

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+# Changelog
+
+## Unreleased
+
+* [Feature] Support multiple domains
+* [Feature] Support after-success hooks
+* [Feature] Ability to run in staging mode

release.sh

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+#!/usr/bin/env bash
+
+# File is a modified copy from https://github.com/michaelsauter/crane/blob/master/release.sh
+
+set -eux
+
+version=$1
+
+if [ -z "$version"  ]; then
+  echo "No version passed! Example usage: ./release.sh 1.0.0"
+    exit 1
+  fi
+
+  echo "Update version..."
+  old_version=$(grep -o "[0-9]*\.[0-9]*\.[0-9]*" VERSION)
+  sed -i.bak 's/Version = "'$old_version'"/Version = "'$version'"/' VERSION
+  rm VERSION.bak
+  sed -i.bak 's/'$old_version'/'$version'/' README.md
+  rm README.md.bak
+
+  echo "Mark version as released in changelog..."
+  today=$(date +'%Y-%m-%d')
+  sed -i.bak 's/Unreleased/Unreleased\
+    \
+    ## '$version' ('$today')/' CHANGELOG.md
+  rm CHANGELOG.md.bak
+
+  echo "Update contributors..."
+  git contributors | awk '{for (i=2; i<NF; i++) printf $i " "; print $NF}' > CONTRIBUTORS
+
+  echo "Update repository..."
+  git add VERSION README.md CHANGELOG.md
+  git commit -m "Bump version to ${version}"
+  git tag --message="v$version" --force "v$version"
+  git tag --message="latest" --force latest
+
+  echo "v$version tagged."
+  echo "Now, run 'git push origin master && git push --tags --force' and publish the release on GitHub."
+fi