Add missing dependency

Fixes #59

Author: znck

package.json

@@ -37,9 +37,11 @@
   },
   "homepage": "https://github.com/znck/rollup-plugin-vue#readme",
   "dependencies": {
+    "babel-runtime": "^6.22.0",
     "de-indent": "^1.0.2",
     "debug": "^2.6.0",
     "html-minifier": "^3.2.3",
+    "less": "^2.7.2",
     "magic-string": "^0.19.0",
     "node-sass": "^4.5.0",
     "parse5": "^3.0.1",
@@ -51,8 +53,7 @@
     "rollup-pluginutils": "^2.0.1",
     "vue-template-compiler": "^2.1.10",
     "vue-template-es2015-compiler": "^1.5.0",
-    "vue-template-validator": "^1.1.5",
-    "less": "latest"
+    "vue-template-validator": "^1.1.5"
   },
   "devDependencies": {
     "babel-eslint": "^7.1.1",
@@ -75,7 +76,6 @@
     "mocha-lcov-reporter": "^1.2.0",
     "rollup": "^0.41.4",
     "rollup-plugin-babel": "^2.7.1",
-    "rollup-plugin-buble": "^0.15.0",
     "rollup-plugin-css-only": "^0.2.0",
     "rollup-plugin-replace": "^1.1.1",
     "uglify-js": "^2.7.5",