Update algoliasearch to the latest version � (#772)

Summary:
## The dependency [algoliasearch]() was updated from `3.35.1` to `4.0.0`.
This version is **not covered** by your **current version range**.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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**Publisher:** [nunomaduro](https://www.npmjs.com/~nunomaduro)
**License:** MIT

[Find out more about this release]().

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Your [Greenkeeper](https://greenkeeper.io) bot 🌴
Pull Request resolved: https://github.com/facebook/flipper/pull/772

Test Plan: Manually tested searching and installing still works.

Reviewed By: jknoxville

Differential Revision: D19690706

Pulled By: passy

fbshipit-source-id: 46cb05fb2c0429c4a1f7fb31a833cd000805825d

src/utils/pluginManager.tsx

@@ -12,7 +12,7 @@ import fs from 'fs-extra';
 import {homedir} from 'os';
 import {PluginMap, PluginDefinition} from '../reducers/pluginManager';
 import {PluginManager as PM} from 'live-plugin-manager';
-import algoliasearch from 'algoliasearch';
+import {default as algoliasearch, SearchIndex} from 'algoliasearch';
 import NpmApi, {Package} from 'npm-api';
 import semver from 'semver';
 
@@ -28,7 +28,7 @@ export function providePluginManager(): PM {
 }
 
 // TODO(T57014856): This should be private, too.
-export function provideSearchIndex(): algoliasearch.Index {
+export function provideSearchIndex(): SearchIndex {
   const client = algoliasearch(ALGOLIA_APPLICATION_ID, ALGOLIA_API_KEY);
   return client.initIndex('npm-search');
 }