Update links (#331) - http => https

diff --git a/.clang-format b/.clang-format
index 503dfe5..cfdad2a 100644
--- a/.clang-format
+++ b/.clang-format
@@ -1,4 +1,4 @@
-# http://clang.llvm.org/docs/ClangFormatStyleOptions.html
+# https://clang.llvm.org/docs/ClangFormatStyleOptions.html
 
 DisableFormat: false
 Language: Cpp