Add `filter-branch-all`

diff --git a/filter-branch-all b/filter-branch-all
new file mode 100755 (executable)
index 0000000..6a4abb3
--- /dev/null
+++ b/filter-branch-all
@@ -0,0 +1,7 @@
+#! /bin/sh
+
+# Just a reminder how to properly run `git filter-branch --all`
+
+FILTER_BRANCH_SQUELCH_WARNING=1 exec git filter-branch \
+    --tag-name-filter cat "$@" -- --branches --tags
+