Update .gitignore for sdk/platform-tools/package.xml

Otherwise the file appears to be untracked whenever one
goes into this directory, which is annoying.

BUG=NONE
R=agrieve@chromium.org,jbudorick@chromium.org,yfriedman@chromium.org

Change-Id: Icadb53c336bdc3f11daac3e295967f722da307a5
Reviewed-on: https://chromium-review.googlesource.com/c/1449574
Reviewed-by: John Budorick <jbudorick@chromium.org>
1 file changed
tree: 74fab66a0f1773bf1334be6f78afd759b994daea
  1. .gitignore
  2. DEPS
  3. LICENSE
  4. OWNERS
  5. README.chromium
  6. codereview.settings
  7. sdk/