Add save svg-badge directly to gist

This adds the posibility of saving an SVG badge generated by the same
shields.io dirictly to the gist. Instead of prepering a JSON file to
be sent to their service, we use their library directly, which outputs
an SVG file that we can save to the user’s gist.

Filenames ending in `.svg` will use this library automatically.

Additionally there is a major refactoring where the older `node:http`
library has been swapped out for `fetch`.

Also swap from node 16 to node 20

fixes #24

node_modules/anafanafo/CHANGELOG.md

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+# Changelog
+
+## 2.0.0 – Oct 15, 2020
+
+Same as 2.0.0-beta.1.
+
+### BREAKING CHANGES
+
+- Support the font variants used by Shields:
+  - 10px Verdana
+  - bold 10px Verdana
+  - 11px Verdana
+  - bold 11px Helvetica
+
+## 2.0.0-beta.1 – Oct 11, 2020
+
+### BREAKING CHANGES
+
+- Support the font variants used by Shields:
+  - 10px Verdana
+  - bold 10px Verdana
+  - 11px Verdana
+  - bold 11px Helvetica
+
+## 2.0.0-beta.0 – Oct 11, 2020
+
+### BREAKING CHANGES
+
+- Support 10px and 11px Verdana, in normal and bold.
+
+## 1.0.0 – Apr 12, 2018
+
+- Update dependencies.
+- Stable API.
+
+## 0.1.1 – Nov 15, 2018
+
+- Require the JSON file (instead of `loadSync`-ing it) to play well with
+  module bundlers.
+
+## 0.1.0 – Nov 13, 2018
+
+Initial release.

node_modules/anafanafo/LICENSE

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+MIT License
+
+Copyright (c) 2018 Metabolize LLC
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

node_modules/anafanafo/README.md

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+# anafanafo
+
+[![version](https://img.shields.io/npm/v/anafanafo?style=flat-square)][npm]
+[![license](https://img.shields.io/npm/l/anafanafo?style=flat-square)][npm]
+[![build](https://img.shields.io/circleci/project/github/metabolize/anafanafo/main?style=flat-square)][build]
+[![bundle size](https://img.shields.io/bundlephobia/minzip/anafanafo?style=flat-square)][bundlephobia]
+[![code style](https://img.shields.io/badge/code_style-prettier-ff69b4?style=flat-square)][prettier]
+[![lerna](https://img.shields.io/badge/maintained%20with-lerna-cc00ff?style=flat-square)][lerna]
+
+[npm]: https://npmjs.com/anafanafo
+[build]: https://circleci.com/gh/metabolize/anafanafo/tree/main
+[bundlephobia]: https://bundlephobia.com/result?p=anafanafo
+[prettier]: https://prettier.io/
+[lerna]: https://lernajs.io/
+
+Efficiently compute text width in Verdana and Helvetica using
+[char-width-table-consumer][] and lookup tables.
+
+Built with [Shields][] in mind.
+
+(And because Verdana always makes me think of [this][the name game].)
+
+[char-width-table-consumer]: https://www.npmjs.com/package/char-width-table-consumer
+[shields]: https://github.com/badges/shields/
+[the name game]: https://www.youtube.com/watch?v=5MJLi5_dyn0
+
+## Usage
+
+```js
+const anafanafo = require('anafanafo')
+
+// Supports '11px Verdana', '10px Verdana', 'bold 10px Verdana', and 'bold 11px Helvetica'.
+const width = anafanafo('Shirley Shirley', { font: '11px Verdana' })
+```
+
+## License
+
+All rights to Verdana are owned by Microsoft Corp.
+
+The remainder of this project is licensed under the MIT license.

node_modules/anafanafo/index.js

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+'use strict'
+
+const { createConsumer } = require('char-width-table-consumer')
+
+const consumers = {
+  '10px Verdana': createConsumer(require('./data/verdana-10px-normal.json')),
+  'bold 10px Verdana': createConsumer(require('./data/verdana-10px-bold.json')),
+  '11px Verdana': createConsumer(require('./data/verdana-11px-normal.json')),
+  'bold 11px Helvetica': createConsumer(
+    require('./data/helvetica-11px-bold.json')
+  ),
+}
+
+module.exports = function measure(text, { font, ...rest }) {
+  const consumer = consumers[font]
+  if (!consumer) {
+    throw Error(
+      `Unknown font "${font}", expected ${Object.keys(consumers).join(', ')}`
+    )
+  }
+  return consumer.widthOf(text, { ...rest })
+}

node_modules/anafanafo/package.json

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+{
+  "name": "anafanafo",
+  "version": "2.0.0",
+  "repository": "metabolize/anafanafo",
+  "description": "Compute text width in Verdana",
+  "scripts": {
+    "test": "../../node_modules/.bin/mocha test.js"
+  },
+  "author": "Metabolize",
+  "license": "MIT",
+  "dependencies": {
+    "char-width-table-consumer": "^1.0.0"
+  },
+  "files": [
+    "index.js",
+    "data/*.json"
+  ]
+}