Add package lock to gitignore (microsoft#16770)

weswigham · web-flow · commit 296660a2a077 · 2017-07-05T12:51:32.000-07:00
diff --git a/.gitignore b/.gitignore
@@ -57,4 +57,5 @@ internal/
 !tests/cases/projects/NodeModulesSearch/**/*
 !tests/baselines/reference/project/nodeModules*/**/*
 .idea
-yarn.lock
+yarn.lock
+package-lock.json
