chore: do not require version for bump.sh

Let lerna do it's magic.

Fix up CHANGELOG to adhere to Lerna's requirements.

CHANGELOG.md

@@ -1,4 +1,8 @@
-<a name="0.10.0"></a>
+# Change Log
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
 ## [0.10.0](https://github.com/awslabs/aws-cdk/compare/v0.9.2...v0.10.0) (2018-09-27)
 
 This release introduces a better way to "escape" L2 constructs in case of missing features

bump.sh

@@ -1,21 +1,5 @@
 #!/bin/bash
 set -euo pipefail
-ver=${1:-}
-if [ -z "${ver}" ]; then
-  echo "usage: ./bump.sh <version>"
-  exit 1
-fi
-
 /bin/bash ./install.sh
-
-lerna publish --force-publish=* --skip-npm --skip-git --repo-version ${ver}
-
-# Update CHANGELOG.md only at the root
-cat > /tmp/context.json <<HERE
-{
-  "version": "${ver}"
-}
-HERE
-
-conventional-changelog -p angular -i CHANGELOG.md -s --context /tmp/context.json
+lerna version --force-publish=* --no-git-tag-version --no-push --conventional-commits