update for d3 v4

LICENSE

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+Copyright {YEAR}, {OWNER}
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the author nor the names of contributors may be used to
+  endorse or promote products derived from this software without specific prior
+  written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

eslintrc.json

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+{
+    "env": {
+        "browser": true,
+        "commonjs": true
+    },
+    "extends": "eslint:recommended",
+    "parserOptions": {
+      "sourceType": "module"
+    },
+    "ecmaFeatures": {"blockBindings": true},
+    "rules": {
+        "indent": ["warn", 4],
+        "linebreak-style": ["error", "unix"],
+        "quotes": ["warn", "single"],
+        "semi": ["error", "always"],
+        "strict": ["error", "safe"],
+        "no-dupe-keys": "error",
+        "one-var": ["error", {
+          "var": "always",
+          "let": "never",
+          "const": "never"
+        }],
+        "space-before-function-paren": ["error", "never"],
+        "space-before-blocks": ["error", "always"],
+        "space-infix-ops": "error",
+        "key-spacing": ["error", {
+          "afterColon": true,
+          "mode": "strict"
+        }],
+        "func-style": ["error", "expression"],
+        "eqeqeq": "error",
+        "dot-notation": "error",
+        "no-redeclare": "error",
+        "radix": "error",
+        "vars-on-top": "error",
+        "no-trailing-spaces": "error",
+        "no-mixed-spaces-and-tabs": "error",
+        "one-var-declaration-per-line": ["error", "always"],
+        "newline-per-chained-call": ["error", {"ignoreChainWithDepth": 3}],
+        "no-console": ["error", { "allow": ["warn", "error"] }],
+        "no-debugger": "error",
+        "no-use-before-define": "error",
+        "no-unused-vars": ["error", {"args": "none"}],
+        "no-native-reassign": ["error", {"exceptions": ["document"]}]
+    }
+}

index.js

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+import { selection, select } from "d3-selection";
+
+import { default as parent } from './src/parent';
+
+selection.prototype.parent = parent
+
+export { selection, select }

package.json

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+{
+  "name": "d3-parent",
+  "version": "2.0.0",
+  "description": "select parent nodes",
+  "keywords": [
+    "d3",
+    "d3-module",
+    "dom",
+    "selection"
+  ],
+  "license": "BSD-3-Clause",
+  "main": "build/d3-parent.js",
+  "jsnext:main": "index",
+  "homepage": "https://github.com/vijithassar/d3-parent",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/vijuithassar/d3-parent.git"
+  },
+  "scripts": {
+    "lint": "eslint --config eslintrc.json src/*.js && eslint --config eslintrc.json test/*.js",
+    "pretest": "rm -rf build && mkdir build && rollup -g d3-selection:d3,d3-parent:d3 -f umd -n d3 -o build/d3-parent.js -- index.js && npm run lint",
+    "test": "tape 'test/**/*-test.js'",
+    "prepublish": "npm run test && uglifyjs build/d3-parent.js -c -m -o build/d3-parent.min.js",
+    "postpublish": "zip -j build/d3-parent.zip -- LICENSE README.md build/d3-parent.js build/d3-parent.min.js"
+  },
+  "dependencies": {
+    "d3-selection": "^1.0.0"
+  },
+  "devDependencies": {
+    "eslint": "^3.3.1",
+    "jsdom": "^9.4.2",
+    "rollup": "0.27",
+    "tape": "4",
+    "uglify-js": "2"
+  }
+}