Update postpublish, Rollup.

package.json

@@ -28,7 +28,7 @@
     "pretest": "rm -rf build && mkdir build && rollup --banner \"$(preamble)\" -g d3-collection:d3,d3-dispatch:d3,d3-quadtree:d3,d3-timer:d3 -f umd -n d3 -o build/d3-force.js -- index.js",
     "test": "tape 'test/**/*-test.js' && eslint index.js src",
     "prepublish": "npm run test && uglifyjs --preamble \"$(preamble)\" build/d3-force.js -c -m -o build/d3-force.min.js",
-    "postpublish": "VERSION=`node -e 'console.log(require(\"./package.json\").version)'`; git push && git push --tags && cp build/d3-force.js ../d3.github.com/d3-force.v1.js && cp build/d3-force.min.js ../d3.github.com/d3-force.v1.min.js && cd ../d3.github.com && git add d3-force.v1.js d3-force.v1.min.js && git commit -m \"d3-force ${VERSION}\" && git push && cd - && zip -j build/d3-force.zip -- LICENSE README.md build/d3-force.js build/d3-force.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-force/build/d3-force.js d3-force.v1.js && cp ../d3-force/build/d3-force.min.js d3-force.v1.min.js && git add d3-force.v1.js d3-force.v1.min.js && git commit -m \"d3-force ${VERSION}\" && git push && cd - && zip -j build/d3-force.zip -- LICENSE README.md build/d3-force.js build/d3-force.min.js"
   },
   "dependencies": {
     "d3-collection": "1",
@@ -39,7 +39,7 @@
   "devDependencies": {
     "eslint": "2",
     "package-preamble": "0.0",
-    "rollup": "0.33",
+    "rollup": "0.34",
     "tape": "4",
     "uglify-js": "2"
   }