chore: fix gitignore entry for tmp (#184)

Trott · web-flow · commit fc4a73b7f857 · 2021-05-29T11:50:15.000-07:00
tmp is a symlink and not a directory so `tmp/` doesn't work to ignore
it.
diff --git a/.gitignore b/.gitignore
@@ -37,4 +37,4 @@ jspm_packages
 .node_repl_history
 
 # Cloned nodejs/node for testing
-tmp/
+tmp
