[tool] update sane dep

Summary: sane@2 added fsevents support. sane@3 bumped the minimum node version to 6.0, same as ours. sane@4 removed fsevents support, but that seems to be controversial, so excluding it for now: amasad/sane#130

Reviewed By: gabelevi

Differential Revision: D17425813

fbshipit-source-id: 426aee1710cd84a5bf27ddbfc8c5977b33e053fd

Author: mroch

packages/flow-dev-tools/package.json

@@ -25,7 +25,7 @@
     "newtests": "*",
     "resolve": "^1.1.7",
     "rimraf": "^2.5.2",
-    "sane": "^1.4.0",
+    "sane": "^1.4.0 || ^2.0.0 || ^3.0.0",
     "semver": "^5.6.0",
     "source-map-support": "~0.4.0",
     "twit": "^2.1.5",