update readme

README.md

@@ -105,15 +105,18 @@ sets:
 # the default configuration.
 exclude:
   - "vendor/**"
-  - "**/zz_generated.**"
-  - "**/zz_generated_**"
   - ".git/**"
-  - "node_modules/**"
   - "_build/**"
+  - "node_modules/**"
+  - "**/zz_generated.**"
+  - "**/zz_generated_**"
+  - "**/generated.pb.go"
+  - "**/generated.proto"
+  - "**/*_generated.go"
 
 # whether or not to detect generated files by their content, this means
 # checking if a top-line comment containing `(been generated|generated by|do not edit)`
-# exists
+# exists _before_ the package declaration
 detectGeneratedFiles: true
 
 # whether or not to remove unused imports; usually this is not needed,
@@ -131,14 +134,7 @@ Put the configuration either in a `.gimps.yaml` in the module root (recommended)
 it explicitly via `-config`.
 
 Provide one or more arguments, each being either a file or a directory. Directories are
-automatically traversed recursively, except for a few ignored items:
-
-- `vendor`
-- `.git`
-- `_build`
-- `zz_generated.*`
-- `zz_generated_*`
-- files that contain `(been generated|generated by|do not edit)` (case insensitive) in their first line
+automatically traversed recursively, except for the items noted in the example configuration above.
 
 **Important:** The first argument controls the Go module path for the entire operation. It's not
 recommended to make gimps work across multiple modules at the same time. Usually you want to
@@ -148,6 +144,8 @@ editor integration when needed.
 For the editor integration, you can specify `-stdout` to print the formatted file to stdout. This
 only makes sense if you provide exactly one file, otherwise separating the output is difficult.
 
+If you just want to see which files would be fixed, run with `-dry-run`.
+
 ```bash
 $ cd ~/myproject
 $ gimps .