Update changelog-tool usage to match new 0.3.0 interface

RELEASE_PROCESS.md

@@ -7,7 +7,7 @@ This document is aimed at members of the Pony team who might be cutting a releas
 In order to do a release, you absolutely must have:
 
 * Commit access to the `pony-stable` repo
-* The latest release of the [changelog tool](https://github.com/ponylang/changelog-tool/releases) installed
+* Version 0.3.x or later of the [changelog tool](https://github.com/ponylang/changelog-tool/releases) installed
 * Access to the ponylang twitter account
 * An account on reddit for posting release notes
 * An account on the [Pony Zulip](https://ponylang.zulipchat.com)

release.bash

@@ -54,7 +54,7 @@ git checkout -b "release-$version" "$commit"
 
 # update VERSION and CHANGELOG
 update_version
-changelog-tool release CHANGELOG.md "$version" -e
+changelog-tool release "$version" -e
 
 # commit VERSION and CHANGELOG updates
 git add CHANGELOG.md VERSION
@@ -81,7 +81,7 @@ git push origin "$version"
 # update CHANGELOG for new entries
 git checkout master
 git merge "release-$version"
-changelog-tool unreleased CHANGELOG.md -e
+changelog-tool unreleased -e
 
 # check if user wants to continue
 check_for_commit_and_push