add lint command

Author: aherlihy

package.json

@@ -9,6 +9,7 @@
     "clean": "lerna clean -y && rm -Rf node_modules",
     "check": "echo",
     "check-ci": "echo",
+    "lint": "lerna run check --since HEAD --exclude-dependents",
     "test": "lerna run test",
     "test-ci": "lerna run test-ci",
     "compile-ts": "lerna run compile-ts",