Updated cURL version.

extensions/curl/curl-src/docs/libcurl/ABI

@@ -13,7 +13,7 @@ ABI - Application Binary Interface
   conventions, function arguments, return values, struct sizes/defines and
   more.
 
-  For a longer descricption, see
+  For a longer description, see
   http://en.wikipedia.org/wiki/Application_binary_interface
 
 Upgrades
@@ -36,7 +36,7 @@ Soname Bumps
   breakage, that may require your application to get attention or possibly be
   changed to adhere to new things, we will bump the soname. Then the library
   will get a different output name and thus can in fact be installed in
-  parallell with an older installed lib (on most systems). Thus, old
+  parallel with an older installed lib (on most systems). Thus, old
   applications built against the previous ABI version will remain working and
   using the older lib, while newer applications build and use the newer one.
 
@@ -52,3 +52,18 @@ Downgrades
   that doesn't support the options your application needs. Or possibly you
   even downgrade so far so you cross an ABI break border and thus a different
   soname, and then your application may need to adapt to the modified ABI.
+
+History
+
+  The previous major library soname number bumps (breaking backwards
+  compatibility) have happened the following times:
+
+  0 - libcurl 7.1,   August 2000
+
+  1 - libcurl 7.5    December 2000
+
+  2 - libcurl 7.7    March 2001
+
+  3 - libcurl 7.12.0 June 2004
+
+  4 - libcurl 7.16.0 October 2006