pin css-tree at 1.0.0-alpha16
@ -57,7 +57,7 @@
"babel-register": "^6.23.0",
"codecov": "^1.0.1",
"console-group": "^0.3.2",
"css-tree": "^1.0.0-alpha16",
"css-tree": "1.0.0-alpha16",
"eslint": "^3.12.2",
"eslint-plugin-import": "^2.2.0",
"estree-walker": "^0.3.0",