Update .arcconfig

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@276214 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/.arcconfig b/.arcconfig
index ef07b36..97a4bf1 100644
--- a/.arcconfig
+++ b/.arcconfig
@@ -1,4 +1,4 @@
 {
   "project_id" : "libunwind",
-  "conduit_uri" : "http://reviews.llvm.org/"
+  "conduit_uri" : "https://reviews.llvm.org/"
 }