Fixed a security flaw with broken EPUBs

Makefile

@@ -1,4 +1,4 @@
-VERSION := 2.09
+VERSION := 2.10
 CC      := gcc
 EXTRA_CFLAGS ?= 
 EXTRA_LDLAGS ?= 

README.md

@@ -1,6 +1,6 @@
 # epub2txt -- Extract text from EPUB documents  
 
-Version 2.09, June 2024 
+Version 2.10, September 2024 
 
 ## What is this? 
 
@@ -244,6 +244,7 @@ covered.
 
 Date | Change
 -----|-------
+2.10, Sep 2024 | Rejected links to documents outside the EPUB
 2.09, Aug 2024 | Improved failure mode wth certain corrupt EPUBs 
 2.08, Jun 2024 | Fixed a memory-management warning 
 ?, Jun 2024 | Removed position-independent code attributes from defaults 

man1/epub2txt.1

@@ -3,7 +3,7 @@
 .\" redistribute this software so long as all of the original files are
 .\" included, and that this copyright notice is retained.
 .\"
-.TH epub2txt 1 "August 2024"
+.TH epub2txt 1 "September 2024"
 .SH NAME
 epub2txt \- Extract text from EPUB documents 
 .SH SYNOPSIS