Change version number to 1.2.18

Changed for library version
diff --git a/doxygen/polarssl.doxyfile b/doxygen/polarssl.doxyfile
index 736dc8b..a09a870 100644
--- a/doxygen/polarssl.doxyfile
+++ b/doxygen/polarssl.doxyfile
@@ -25,7 +25,7 @@
 # The PROJECT_NAME tag is a single word (or a sequence of words surrounded
 # by quotes) that should identify the project.
 
-PROJECT_NAME           = "PolarSSL v1.2.17"
+PROJECT_NAME           = "PolarSSL v1.2.18"
 
 # The PROJECT_NUMBER tag can be used to enter a project or revision number.
 # This could be handy for archiving the generated documentation or