Documentation: FIX: Regression: Re-include assert_files_equal in readme (after ecb78f6)

This was initially documented by bats-core#15, but somehow got lost during the restructuring of the readme file.

(This relates to commit ecb78f6 and ddc08e1)

Author: inkarkat

README.md

@@ -31,7 +31,7 @@ load this library.
 | _Check if a **file or directory** exists!_ <br/> - [assert_exists](#assert_exists) <br/> - [assert_not_exists](#assert_not_exists) | _Check if file is **executable**!_ <br/> - [assert_file_executable](#assert_file_executable) <br/> - [assert_file_not_executable](#assert_file_not_executable) | _Check if file is **empty**!_ <br/> - [assert_file_empty](#assert_file_empty) <br/> - [assert_file_not_empty](#assert_file_not_empty) |
 | _Check if a **file** exists!_ <br/> - [assert_file_exists](#assert_file_exists) <br/> - [assert_file_not_exists](#assert_file_not_exists) | _Check the **owner** of a file!_ <br/> - [assert_file_owner](#assert_file_owner) <br/> - [assert_file_not_owner](#assert_file_not_owner) | _Check if file **contains regex**!_ <br/>  - [assert_file_contains](#assert_file_contains) <br/> - [assert_file_not_contains](#assert_file_not_contains) |
 | _Check if a **directory** exists!_ <br/> - [assert_dir_exists](#assert_dir_exists) <br/> - [assert_dir_not_exists](#assert_dir_not_exists) | _Check the **permission** of a file!_ <br/> - [assert_file_permission](#assert_file_permission) <br/> - [assert_not_file_permission](#assert_not_file_permission) | _Check if file is a **symlink to target**!_ <br/> - [assert_symlink_to](#assert_symlink_to) <br/> - [assert_not_symlink_to](#assert_not_symlink_to) |
-| _Check if a **link** exists!_ <br/> - [assert_link_exists](#assert_link_exists) <br/> - [assert_link_not_exists](#assert_link_not_exists) | _Check the **size** of a file **by bytes**!_ <br/> - [assert_file_size_equals](#assert_file_size_equals) |
+| _Check if a **link** exists!_ <br/> - [assert_link_exists](#assert_link_exists) <br/> - [assert_link_not_exists](#assert_link_not_exists) | _Check the **size** of a file **by bytes**!_ <br/> - [assert_file_size_equals](#assert_file_size_equals) | _Check if file **contents are the same**!_ <br/> - [assert_files_equal](#assert_files_equal) |
 | _Check if a **block special file** exists!_ <br/> - [assert_block_exists](#assert_block_exists) <br/> - [assert_block_not_exists](#assert_block_not_exists) | _Check if a file have **zero bytes**!_ <br/> - [assert_size_zero](#assert_size_zero) <br/> - [assert_size_not_zero](#assert_size_not_zero) |
 | _Check if a **character special file** exists!_ <br/> - [assert_character_exists](#assert_character_exists) <br/> - [assert_character_not_exists](#assert_character_not_exists) | _Check the **groupID** of a file!_ <br/> - [assert_file_group_id_set](#assert_file_group_id_set) <br/> - [assert_file_not_group_id_set](#assert_file_not_group_id_set) |
 | _Check if a **socket** exists!_ <br/> - [assert_socket_exists](#assert_socket_exists) <br/> - [assert_socket_not_exists](#assert_socket_not_exists) | _Check the **userID** of a file!_ <br/> - [assert_file_user_id_set](#assert_file_user_id_set) <br/> - [assert_file_not_user_id_set](#assert_file_not_user_id_set) |
@@ -797,6 +797,22 @@ path : /path/to/symlink
 ```
 [Back to index](#Index-of-all-functions)
 
+### `assert_files_equal`
+Fail if the given files are not the same.
+```bash
+@test 'assert_files_equal()' {
+  assert_files_equal /path/to/file1 /path/to/file2
+}
+```
+On failure, the paths are displayed.
+```
+-- files are not the same --
+path1 : /path/to/file1
+path2 : /path/to/file2
+--
+```
+[Back to index](#Index-of-all-functions)
+
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