Add warning about display_errors

Author: 132ikl

blog/2024-09-17-nushell_0_98_0.md

@@ -12,6 +12,20 @@ Nushell, or Nu for short, is a new shell that takes a modern, structured approac
 
 Today, we're releasing version 0.98.0 of Nu. This release changes non-zero exit codes from external commands to be handled as errors, makes the IR evaluator the default, removes support for the system clipboard, and includes many command changes and bugfixes.
 
+::: warning New error behavior
+This release adds a new error when an [external exits with a non-zero exit code](#non-zero-exit-codes-are-now-errors-toc). In the default config, this error is suppressed in the REPL. However, **if you are upgrading with existing config, you must add this section to your $env.config to suppress this error**:
+
+```
+display_errors: {
+    exit_code: false
+    # Core dump errors are always printed, and SIGPIPE never triggers an error.
+    # The setting below controls message printing for termination by all other signals.
+    termination_signal: true
+}
+```
+
+:::
+
 # Where to get it
 
 Nu 0.98.0 is available as [pre-built binaries](https://github.com/nushell/nushell/releases/tag/0.98.0) or from [crates.io](https://crates.io/crates/nu). If you have Rust installed you can install it using `cargo install nu`.