Upgrade dependencies

package.json

@@ -5,6 +5,7 @@
   "version": "0.15.2",
   "repository": "https://github.com/rich-harris/magic-string",
   "main": "dist/magic-string.cjs.js",
+  "module": "dist/magic-string.es6.js",
   "jsnext:main": "dist/magic-string.es6.js",
   "license": "MIT",
   "dependencies": {
@@ -15,12 +16,12 @@
     "console-group": "^0.2.1",
     "eslint": "^2.11.1",
     "istanbul": "^0.4.3",
-    "mocha": "^2.5.3",
+    "mocha": "^3.0.1",
     "remap-istanbul": "^0.6.4",
     "resolve": "^1.1.7",
-    "rollup": "^0.31.0",
-    "rollup-plugin-buble": "^0.10.0",
-    "rollup-plugin-node-resolve": "^1.7.0",
+    "rollup": "^0.34.5",
+    "rollup-plugin-buble": "^0.12.1",
+    "rollup-plugin-node-resolve": "^2.0.0",
     "rollup-plugin-replace": "^1.1.0",
     "source-map": "^0.5.6",
     "source-map-support": "^0.4.0"