Adding upstream version 2.2.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

testing/resources/stdout_stderr_repo/.pre-commit-hooks.yaml

@@ -0,0 +1,8 @@
+-   id: stdout-stderr
+    name: stdout-stderr
+    language: script
+    entry: ./stdout-stderr-entry
+-   id: tty-check
+    name: tty-check
+    language: script
+    entry: ./tty-check-entry

testing/resources/stdout_stderr_repo/stdout-stderr-entry

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+echo 0
+echo 1 1>&2
+echo 2
+echo 3 1>&2
+echo 4
+echo 5 1>&2

testing/resources/stdout_stderr_repo/tty-check-entry

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+t() {
+    if [ -t "$1" ]; then
+        echo "$2: True"
+    else
+        echo "$2: False"
+    fi
+}
+t 0 stdin
+t 1 stdout
+t 2 stderr