lerna 3.0.0-rc.0 on Node.js Yarn

changed: Clarify early exit log message (b132c3a)
cli: Pass global defaults into option factory instead of yargs.config() (cf4008a), closes #1449
command: Prevent premature resolution during tests from nested commands (151363f)
core/package: Serialize hosted git URLs with original protocol/shorthand (60ff432), closes #1499
project: Report syntax errors in root package.json (f674f35), closes #1452
publish: Add default description 'npm' for --npm-client (649048c)
publish: Avoid fs-extra warning on 32-bit machines (e908d23)
publish: Do not leave unstaged changes with --skip-git (2d497ed)
publish: Exit early when publishing w/o commits (#1453) (6cbae35), closes #773
publish: Pass --repo-version argument through semver.valid() (272e9f1), closes #1483
publish: Update lerna.json version after root preversion lifecycle (7b3817c), closes #1495
tests: Special handling for Windows CI issues (#1441) (1a01125)

Add description from --help summary [skip ci] (9b65d8e)
Count packages affected in command summary logging (5f5e585)
publish: Ensure published packages contain a LICENSE file (#1465) (5863564), closes #1213
Upgrade to fs-extra 6 (079d873)
add: Add --exact option to lerna add (#1478) (346d156), closes #1470
cli: Upgrade to Yargs 12 (7899ab8)
command: Remove this.defaultOptions() from option resolution stack (2b27a54)
ls: Log number of packages listed (855fff6)
package-graph: Add rawPackageList getter (0ad5faf)
project: Move collect-packages into getPackages() method (06b88d4)
publish: Add --require-scripts option to opt-in to raw JS lifecycle scripts (054392b)
publish: Add --amend flag (#1422) (ef5f0db)
run-lifecycle: Encapsulate npm-conf with createRunner() factory (488f98d)

publish: External $PKGDIR/scripts/{pre,post}publish.js lifecycles are now opt-in instead of automatic. Pass --require-scripts explicitly to maintain previous functionality.
collect-updates: Instead of an opaque command instance, distinct positional arguments are required.
command: this.packages no longer exists in Command subclasses, use this.packageGraph.rawPackageList

lerna 3.0.0-rc.0 v3.0.0-rc.0 on Node.js Yarn