Add changelog for 1.1.0

Author: q-litzler

CHANGELOG.md

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+# 1.1.0
+
+- Kotlin version 1.3.41
+- Ktor version 1.2.3-rc
+- Added `enableABTest` as `Query` parameter
+- Added `similarQuery` as `Query` parameter
+- Added `advancedSyntaxFeatures` as `Query` parameter
+- Added `index.exists()` method
+- New `AlgoliaSearchClient` object exposes library version constant
+- Added `Compression` feature. `Gzip` compression is enabled by default.
+- Default `readTimeout` has been increased to 5 seconds
+- It is now possible to configure `HttpClientConfig` in `Configuration`
+- Added `ClientPlaces` to access Algolia Places endpoints. See this [file](docs/Places.md) for getting starting with Places.
+- `QueryLanguage` is renamed to `Language`
+- Fixed a bug in `browseAllABTests` methods