Update .gitignore. (#265)

Ignore the 'pack' directory (which contains nupkgs after a build) and *.binlog
files.

Co-authored-by: Srdjan Jovčić <srdjan@jovcic.net>

.gitignore

@@ -3,6 +3,7 @@ out
 bin
 obj
 packages
+pack
 *.nuget.targets
 *.nuget.props
 *.lock.json
@@ -11,4 +12,5 @@ packages
 *.cache
 .vs
 .*
-log.txt
+log.txt
+*.binlog