Update readme and version.h

Author: igrr

README.md

@@ -1,14 +1,14 @@
 Replacement for Espressif's libssl, kept as close as possible to [axTLS](http://axtls.sourceforge.net/) source.
-Currently based on axTLS 2.0.0+.
+
+Currently based on axTLS 2.1.2 (SVN version 274).
 
 [![Build status](https://travis-ci.org/igrr/axtls-8266.svg)](https://travis-ci.org/igrr/axtls-8266)
 
-This is not a self-sufficient library. Application has to provide the following symbols (list not complete yet):
+## Using the library
+
+This is not a self-sufficient library. In addition to the standard C library functions, application has to provide the following functions:
+
 ```
-ax_port_malloc
-ax_port_calloc
-ax_port_realloc
-ax_port_free
 ax_port_read
 ax_port_write
 ax_port_open
@@ -17,13 +17,18 @@ ax_get_file
 phy_get_rand  (provided by the IoT SDK)
 ets_printf    (in ESP8266 ROM)
 ets_putc      (in ESP8266 ROM)
-gettimeofday
-time
-ctime
 ```
 
 For use with LwIP raw TCP API, see [compat/README.md](https://github.com/attachix/lwirax/blob/master/README.md)
 
-To build, add xtensa toolchain to your path, and run `make`.
+## Building
+
+To build, add xtensa toolchain to your path, and run `make`. The library will be built in `bin/` directory.
+
+## Credits and license
+
+[axTLS](http://axtls.sourceforge.net/) is written and maintained by Cameron Rich.
+
+Other people have contributed to this port; see git logs for a full list.
 
 See [LICENSE](LICENSE) file for axTLS license.

ssl/version.h

@@ -1 +1 @@
-#define AXTLS_VERSION    "2.0.0"
+#define AXTLS_VERSION    "2.1.2"