Use commit from PR

package.json

@@ -39,7 +39,7 @@
     "jasmine-json": "~0.0",
     "jasmine-tagged": "^1.1.2",
     "jquery": "^2.1.1",
-    "less-cache": "0.20.0",
+    "less-cache": "git+https://github.com/atom/less-cache.git#018b1739ae03ee35aae9827d7d7b16d0799c5d42",
     "marked": "^0.3",
     "mixto": "^1",
     "mkdirp": "0.3.5",