detect clang-format-3.5 in a spec

Author: rhysd

t/clang_format_spec.vim

@@ -4,7 +4,7 @@
 " helpers "{{{
 " clang-format detection
 function! s:detect_clang_format()
-    for candidate in ['clang-format-3.4', 'clang-format', 'clang-format-HEAD']
+    for candidate in ['clang-format-3.4', 'clang-format', 'clang-format-HEAD', 'clang-format-3.5']
         if executable(candidate)
             return candidate
         endif