fix : minor edit in setup.py

setup.py

@@ -4,7 +4,21 @@
     from setuptools import setup
 except ImportError:
     from distutils.core import setup
-from pyrgg.params import PYRGG_DESCRIPTION
+from textwrap import fill
+
+_description = """\
+Pyrgg is an easy-to-use synthetic random graph generator written in Python
+which supports various graph file formats including DIMACS .gr files.
+Pyrgg has the ability to generate graphs of different sizes
+and is designed to provide input files
+for broad range of graph-based research applications,
+including but not limited to testing,
+benchmarking and performance-analysis of graph processing frameworks.
+Pyrgg target audiences are computer scientists
+who study graph algorithms and graph processing frameworks.
+"""
+
+PYRGG_DESCRIPTION = fill(_description, width=70)
 
 
 def get_requires():