Merge #458

458: Add missing quotes in README code sample r=alallema a=roshammar

# Pull Request

## What does this PR do?
Fixes #457 

## PR checklist
Please check if your PR fulfills the following requirements:
- [x] Does this PR fix an existing issue?
- [x] Have you read the contributing guidelines?
- [x] Have you made sure that the title is accurate and descriptive of the changes?

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Co-authored-by: Kristoffer Röshammar <[email protected]>

Author: bors[bot]

README.md

@@ -173,7 +173,7 @@ Then, you can perform the search:
 index.search(
   'wonder',
   {
-    filter: ['id > 1 AND genres = Action']
+    'filter': ['id > 1 AND genres = Action']
   }
 )
 ```