Update library version to 2.18.0
Increase the SO versions of libmbedx509 and libmbedtls due to the
addition of fields in publicly visible (non-opaque) structs:
- mbedtls_ssl_config
- mbedtls_ssl_context
- mbedtls_x509_crt
diff --git a/doxygen/input/doc_mainpage.h b/doxygen/input/doc_mainpage.h
index 4eff836..487faf8 100644
--- a/doxygen/input/doc_mainpage.h
+++ b/doxygen/input/doc_mainpage.h
@@ -24,7 +24,7 @@
*/
/**
- * @mainpage mbed TLS v2.17.0 source code documentation
+ * @mainpage mbed TLS v2.18.0 source code documentation
*
* This documentation describes the internal structure of mbed TLS. It was
* automatically generated from specially formatted comment blocks in