Merge pull request #58 from pedoc/master

switch to netstandard2.0 and remove unused using

Author: Postlagerkarte

src/Geohash.csproj

@@ -1,9 +1,9 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFrameworks>netstandard2.0;net6.0</TargetFrameworks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
-    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+    <GeneratePackageOnBuild>false</GeneratePackageOnBuild>
     <PackageId>geohash-dotnet</PackageId>
     <Authors>Hans-Juergen Pavelka</Authors>
     <Company>Hans-Juergen Pavelka</Company>

src/PolygonHasher.cs

@@ -1,11 +1,7 @@
-using NetTopologySuite.Geometries;
-using NetTopologySuite.Index.Strtree;
+using NetTopologySuite.Geometries;
 using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
-using System.ComponentModel;
-using System.Diagnostics;
-using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -161,4 +157,4 @@ public HashSet<string> GetHashes(Polygon polygon, int geohashPrecision, GeohashI
         }
 
     }
-}
+}