Repository: J-F-Liu/lopdf (language: rust)

Issue:
Add a documentation to PDFutils to replace_text and update readme.md


We should fix the documentiation [lopdf](https://github.com/J-F-Liu/lopdf)/[pdfutil](https://github.com/J-F-Liu/lopdf/tree/master/pdfutil)/README.md to and and some exemples  
USAGE:
    pdfutil [OPTIONS] [SUBCOMMAND]

FLAGS:
    -h, --help       Prints help information
    -V, --version    Prints version information

OPTIONS:
    -i, --input <input file>      
    -o, --output <output file>    

SUBCOMMANDS:
    compress                      Compress PDF document
    decompress                    Decompress PDF document
    delete_objects                Delete objects
    delete_pages                  Delete pages
    delete_zero_length_streams    Delete zero length stream objects
    extract_pages                 Extract pages
    extract_stream                Extract stream content
    extract_text                  Extract text
    help                          Prints this message or the help of the given subcommand(s)
    print_streams                 Print streams
    process                       Process PDF document with specified operations
    prune_objects                 Prune unused objects
    renumber_objects              Renumber objects
    replace_text                  Replace text


Discussion / hints:

Fix patch:
diff --git a/pdfutil/README.md b/pdfutil/README.md
index 0305aaa..3ca8383 100644
--- a/pdfutil/README.md
+++ b/pdfutil/README.md
@@ -7,8 +7,8 @@ FLAGS:
     -V, --version    Prints version information
 
 OPTIONS:
-    -i, --input <input file>
-    -o, --output <output file>
+    -i, --input <input file>      
+    -o, --output <output file>    
 
 SUBCOMMANDS:
     compress                      Compress PDF document
@@ -16,8 +16,13 @@ SUBCOMMANDS:
     delete_objects                Delete objects
     delete_pages                  Delete pages
     delete_zero_length_streams    Delete zero length stream objects
+    extract_pages                 Extract pages
+    extract_stream                Extract stream content
+    extract_text                  Extract text
     help                          Prints this message or the help of the given subcommand(s)
+    print_streams                 Print streams
     process                       Process PDF document with specified operations
     prune_objects                 Prune unused objects
     renumber_objects              Renumber objects
+    replace_text                  Replace text
 ```


Test patch: