Update gitignore to the latest

Author: pmosk

.gitignore

@@ -82,6 +82,8 @@ StyleCopReport.xml
 *.pgc
 *.pgd
 *.rsp
+# but not Directory.Build.rsp, as it configures directory-level build defaults
+!Directory.Build.rsp
 *.sbr
 *.tlb
 *.tli
@@ -301,7 +303,7 @@ node_modules/
 *.dsw
 *.dsp
 
-# Visual Studio 6 technical files 
+# Visual Studio 6 technical files
 *.ncb
 *.aps
 
@@ -395,4 +397,4 @@ FodyWeavers.xsd
 *.msp
 
 # JetBrains Rider
-*.sln.iml
+*.sln.iml