Update README.md

Author: pdphilip

README.md

@@ -63,7 +63,7 @@ Next, [Configuration](https://elasticsearch.pdphilip.com/#configuration)
 - [Deleting Models](https://elasticsearch.pdphilip.com/deleting-models)
 - [Ordering and Pagination](https://elasticsearch.pdphilip.com/ordering-and-pagination)
 - [Distinct and GroupBy](https://elasticsearch.pdphilip.com/distinct)
-- [Aggregations](https://elasticsearch.pdphilip.com/aggregations)
+- [Aggregations](https://elasticsearch.pdphilip.com/aggregation)
 - [Chunking](https://elasticsearch.pdphilip.com/chunking)
 - [Nested Queries](https://elasticsearch.pdphilip.com/nested-queries) **New in Version 3**
 - [Elasticsearch Specific Queries](https://elasticsearch.pdphilip.com/es-specific)
@@ -113,4 +113,4 @@ This update introduces support for querying, sorting and filtering nested data
 
 - [Grouped Queries](https://elasticsearch.pdphilip.com/querying-models#grouped-queries): Queries can be grouped allowing multiple conditions to be nested within a single query block.
 
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