Use .swift-format-ignore as the file name.

Author: samdeane

README.md

@@ -201,9 +201,9 @@ configuration, by redirecting it to a file and editing it.
 ### Configuring the Command Line Tool
 
 For any source file being checked or formatted, `swift-format` looks for a
-JSON-formatted file named `.no-swift-format` in the same directory. 
+JSON-formatted file named `.swift-format-ignore` in the same directory. 
 The presence of this file will disable all formatting and linting. 
-The contents of `.no-swift-format`  are ignored - it can be an empty file.
+The contents of `.swift-format-ignore`  are ignored - it can be an empty file.
 
 If the file is not found, then it looks in the same directory for a file
 called `.swift-format`. If one is found, then that file is loaded to 

Sources/SwiftFormat/API/Configuration.swift

@@ -32,7 +32,7 @@ public struct Configuration: Codable, Equatable {
   /// Name of the suppression file to look for.
   /// The presence of this file in a directory will cause the formatter
   /// to skip formatting files in that directory and its subdirectories.
-  private static let suppressionFileName = ".no-swift-format"
+  private static let suppressionFileName = ".swift-format-ignore"
 
   private enum CodingKeys: CodingKey {
     case version