chore(): remove use of "bind" proposal code

- Removes the experimental "function bind" syntax code
- Removes a bunch of babel plugins; replaces with "shipped proposals" setting in babel-env
- build now targets Node.js 12
- upgrade eslint; remove now-unnecessary babel eslint parser
- `process.kill.bind(process)` was unnecessary

The output of the build before and after this change looks nearly identical.

Author: boneskull

.eslintrc.js

@@ -9,9 +9,8 @@ module.exports = {
     node: true,
     es6: true,
   },
-  parser: '@babel/eslint-parser',
   parserOptions: {
-    ecmaVersion: 2016,
+    ecmaVersion: 'latest',
     sourceType: 'module',
   },
   rules: {

babel.config.js

@@ -4,17 +4,12 @@ module.exports = {
       '@babel/preset-env',
       {
         targets: {
-          node: 10,
+          node: 12,
         },
+        shippedProposals: true,
       },
     ],
   ],
-  plugins: [
-    '@babel/plugin-proposal-function-bind',
-    '@babel/plugin-proposal-export-default-from',
-    '@babel/plugin-proposal-class-properties',
-    '@babel/plugin-proposal-optional-catch-binding',
-  ],
   env: {
     development: {
       sourceMaps: 'inline',