Document collecting log output

Redirecting stdout writes log output to that file, but this wasn't
easily discoverable.

v2 removes changes to aerc-tutorial; I was also on the fence about that,
and agree that it isn't on-topic for the tutorial.

Addresses https://todo.sr.ht/~sircmpwn/aerc2/180

1 files changed, 4 insertions, 0 deletions

diff --git a/README.md b/README.md
index dac8848..7a07406 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,10 @@ Then compile aerc:
 On its first run, aerc will copy the default config files to `~/.config/aerc`
 and show the account configuration wizard.
 
+If you redirect stdout to a file, logging output will be written to that file:
+
+    $ aerc > log
+
 ## Resources
 
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