Add node modules and new code for release (#57)

Co-authored-by: taakleton <taakleton@users.noreply.github.com>

node_modules/abab/CHANGELOG.md

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+## 2.0.5
+
+-   Use a lookup string in atobLookup and btoaLookup (@GiovanniFrigo in #38)
+-   Dependency updates
+
+## 2.0.4
+
+-   Dependency updates
+
+## 2.0.3
+
+-   Use standard wording for BSD-3-Clause license (@PhilippWendler)
+
+## 2.0.2
+
+-   Correct license in `package.json` (@Haegin)
+
+## 2.0.1
+
+-   Add TypeScript type definitions, thanks to @LinusU
+
+## 2.0.0
+
+Modernization updates thanks to @TimothyGu:
+
+-   Use jsdom's eslint config, remove jscs
+-   Move syntax to ES6
+-   Remove Babel
+-   Via: https://github.com/jsdom/abab/pull/26
+
+## 1.0.4
+
+-   Added license file
+
+## 1.0.3
+
+-   Replaced `let` with `var` in `lib/btoa.js`
+    -   Follow up from `1.0.2`
+    -   Resolves https://github.com/jsdom/abab/issues/18
+
+## 1.0.2
+
+-   Replaced `const` with `var` in `index.js`
+    -   Allows use of `abab` in the browser without a transpilation step
+    -   Resolves https://github.com/jsdom/abab/issues/15