nng_version update.

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+## nng_version
+
+Report library version.
+
+### Synopsis
+
+```c
+#include <nng/nng.h>
+
+const char * nng_version(void);
+```
+
+### Description
+
+The `nng_version` function returns a human readable ((version number)) string for _NNG_.footnote:[This version string is meant for human consumption and should not be used progammatically.]
+
+Additionally, compile time version information is available via the following predefined macros:
+
+[horizontal]
+((`NNG_MAJOR_VERSION`)):: Major version number.
+((`NNG_MINOR_VERSION`)):: Minor version number.
+((`NNG_PATCH_VERSION`)):: Patch version number.
+
+_NNG_ is developed and released using http://www.semver.org[Semantic Versioning 2.0], and the version numbers reported refer to both the API and the library itself.footnote:[The ((ABI)) -- ((application binary interface)) -- between the library and the application is controlled in a similar, but different manner depending upon the link options and how the library is built.]
+
+### Return Values
+
+Zero-terminated string containing the library version number.