show color in hook outputs when attached to a tty

testing/resources/stdout_stderr_repo/stdout-stderr-entry

@@ -0,0 +1,13 @@
+#!/usr/bin/env python
+import sys
+
+
+def main():
+    for i in range(6):
+        f = sys.stdout if i % 2 == 0 else sys.stderr
+        f.write('{}\n'.format(i))
+        f.flush()
+
+
+if __name__ == '__main__':
+    exit(main())