Update Rollup.

package.json

@@ -27,7 +27,7 @@
     "pretest": "rm -rf build && mkdir build && rollup --banner \"$(preamble)\" -f umd -g d3-path:d3 -n d3 -o build/d3-shape.js -- index.js",
     "test": "tape 'test/**/*-test.js' && eslint index.js src",
     "prepublish": "npm run test && uglifyjs --preamble \"$(preamble)\" build/d3-shape.js -c -m -o build/d3-shape.min.js",
-    "postpublish": "VERSION=`node -e 'console.log(require(\"./package.json\").version)'`; git push && git push --tags && cd ../d3.github.com && git pull && cp ../d3-shape/build/d3-shape.js d3-shape.v1.js && cp ../d3-shape/build/d3-shape.min.js d3-shape.v1.min.js && git add d3-shape.v1.js d3-shape.v1.min.js && git commit -m \"d3-shape ${VERSION}\" && git push && cd - && zip -j build/d3-shape.zip -- LICENSE README.md build/d3-shape.js build/d3-shape.min.js"
+    "postpublish": "git push && git push --tags && cd ../d3.github.com && git pull && cp ../d3-shape/build/d3-shape.js d3-shape.v1.js && cp ../d3-shape/build/d3-shape.min.js d3-shape.v1.min.js && git add d3-shape.v1.js d3-shape.v1.min.js && git commit -m \"d3-shape ${npm_package_version}\" && git push && cd - && zip -j build/d3-shape.zip -- LICENSE README.md build/d3-shape.js build/d3-shape.min.js"
   },
   "dependencies": {
     "d3-path": "1"
@@ -36,7 +36,7 @@
     "d3-polygon": "1",
     "eslint": "3",
     "package-preamble": "0.0",
-    "rollup": "0.36",
+    "rollup": "0.41",
     "tape": "4",
     "uglify-js": "2"
   }