Fix casing

Author: JimBobSquarePants

msbuild/props/SixLabors.Src.props

@@ -4,7 +4,7 @@
   <!-- Compilation and build location settings. -->
   <PropertyGroup>
     <SixLaborsProjectCategory>src</SixLaborsProjectCategory>
-    <CodeAnalysisRuleSet Condition="'$(CodeAnalysisRuleSet)' == ''">$(MSBuildThisFileDirectory)..\..\sixLabors.ruleset</CodeAnalysisRuleSet>
+    <CodeAnalysisRuleSet Condition="'$(CodeAnalysisRuleSet)' == ''">$(MSBuildThisFileDirectory)..\..\sixlabors.ruleset</CodeAnalysisRuleSet>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
   </PropertyGroup>
 

msbuild/props/SixLabors.Tests.props

@@ -6,7 +6,7 @@
     <SixLaborsProjectCategory>tests</SixLaborsProjectCategory>
     <IsTestProject Condition="'$(IsTestProject)' == ''">true</IsTestProject>
     <IsPackable>false</IsPackable>
-    <CodeAnalysisRuleSet Condition="'$(CodeAnalysisRuleSet)' == ''">$(MSBuildThisFileDirectory)..\..\sixLabors.tests.ruleset</CodeAnalysisRuleSet>
+    <CodeAnalysisRuleSet Condition="'$(CodeAnalysisRuleSet)' == ''">$(MSBuildThisFileDirectory)..\..\sixlabors.tests.ruleset</CodeAnalysisRuleSet>
   </PropertyGroup>
 
   <!-- Package references and additional files which are consumed by test projects -->