Add the @actions/cache package

Author: eregon

package.json

@@ -26,7 +26,8 @@
     "@actions/core": "^1.2.3",
     "@actions/exec": "^1.0.3",
     "@actions/io": "^1.0.2",
-    "@actions/tool-cache": "^1.3.1"
+    "@actions/tool-cache": "^1.3.1",
+    "@actions/cache": "^0.2.1"
   },
   "devDependencies": {
     "@zeit/ncc": "^0.21.1"