docs: update CHANGELOG.md, remove rollbacked ItemGroups

Author: bednar

CHANGELOG.md

@@ -1,7 +1,10 @@
 ## 1.9.0 [unreleased]
 
+### Features
+1. [#96](https://github.com/influxdata/influxdb-client-csharp/pull/96): The PointData builder is now immutable
+
 ### API
-1. [#94](https://github.com/influxdata/influxdb-client-csharppull/94): Update swagger to latest version
+1. [#94](https://github.com/influxdata/influxdb-client-csharp/pull/94): Update swagger to latest version
 
 ### Bug Fixes
 1. [#100](https://github.com/influxdata/influxdb-client-csharp/pull/100): Thread-safety disposing of clients 

Client.Core/Client.Core.csproj

@@ -39,13 +39,4 @@
       <PackageReference Include="System.Net.Http" Version="4.3.4" />
     </ItemGroup>
 
-    <ItemGroup>
-      <Folder Include="InfluxDB.Client.Api.Domain" />
-    </ItemGroup>
-    
-    <ItemGroup>
-      <Compile Remove="InfluxDB.Client.Api.Domain\WritePrecision.cs" />
-      <Compile Remove="Writes\Events.cs" />
-    </ItemGroup>
-
 </Project>