Remove typo in NuGet package description

Author: Mertsch

src/SixLabors.Core/SixLabors.Core.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <Description>Low level primitives for use across Six Labors projects..</Description>
+        <Description>Low level primitives for use across Six Labors projects.</Description>
         <VersionPrefix Condition="$(packageversion) != ''">$(packageversion)</VersionPrefix>
         <VersionPrefix Condition="$(packageversion) == ''">0.1.0-alpha2</VersionPrefix>
         <Authors>Six Labors</Authors>
@@ -55,4 +55,4 @@
     <ItemGroup Condition=" $(TargetFramework.StartsWith('netstandard')) ">
       <PackageReference Include="System.Numerics.Vectors" Version="4.5.0" />
     </ItemGroup>
-</Project>
+</Project>