Document use of the IMPORT_DEBUG constant (#82)

Author: danielbachhuber

README.md

@@ -16,6 +16,8 @@ wp import <file>... --authors=<authors> [--skip=<data-type>]
 Provides a command line interface to the WordPress Importer plugin, for
 performing data migrations.
 
+Use `define( 'IMPORT_DEBUG', true );` for more verbosity during importing.
+
 **OPTIONS**
 
 	<file>...

src/Import_Command.php

@@ -10,6 +10,8 @@ class Import_Command extends WP_CLI_Command {
 	 * Provides a command line interface to the WordPress Importer plugin, for
 	 * performing data migrations.
 	 *
+	 * Use `define( 'IMPORT_DEBUG', true );` for more verbosity during importing.
+	 *
 	 * ## OPTIONS
 	 *
 	 * <file>...