Add todo comments

packages/@uppy/companion/src/standalone/helper.js

@@ -64,12 +64,14 @@ const getConfigFromEnv = () => {
         verificationToken: getSecret('COMPANION_ZOOM_VERIFICATION_TOKEN'),
         credentialsURL: process.env.COMPANION_ZOOM_KEYS_ENDPOINT,
       },
+      // TODO: remove the redundant searchProviders warpper in next major version
       searchProviders: {
         unsplash: {
           key: process.env.COMPANION_UNSPLASH_KEY,
           secret: process.env.COMPANION_UNSPLASH_SECRET,
         },
       },
+      // TODO: move s3 out of providerOptions, it's a destination, not a source
       s3: {
         key: process.env.COMPANION_AWS_KEY,
         secret: getSecret('COMPANION_AWS_SECRET'),

packages/@uppy/core/src/BasePlugin.js

@@ -75,6 +75,8 @@ module.exports = class BasePlugin {
     throw new Error('Extend the render method to add your plugin to a DOM element')
   }
 
+  // TODO: remove in the next major version. It's not feasible to
+  // try to use plugins with other frameworks.
   // eslint-disable-next-line class-methods-use-this
   update () {}