fixed author reference

fix pointer reference issue

do not test on nightly to avoid marshalling issues

Don't decrease Py_None ref in lastupdate function

Added MANIFEST.in to include header file for source distribution

Rewrote setup script to detect whether newer rrdtool functions can be…

… linked, make fetch callback functions optional to maintain backwards compatibility

Fixed issue commx#15: C99 is not accepted by some compilers by default

Added package dir to include_dirs in setup.py

Update README.md

Removed Travis CI status image temporarily, as Travis seems to have changed their way how dependency packages are permitted to be used.

v0.1.6 CHANGELOG

Release date: Oct 15, 2016

* Reformatted source code for proper indentation.  We'll now use 4 spaces for
  indentation, no tabs.
* Fixed license version numbering in rrdtoolmodule.c.
* Removed getopt externals.
* The  method will not take any arguments from now on.
* Updated include_dirs and added library_dirs for proper lookup on a wider
  range of OSes, including macOS.