Update readme

README.md

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-python simulator for modelling 5G (pysim5g)
+python simulator for integrated modelling of 5G (pysim5g)
 ===========================================
 
 [![Build Status](https://travis-ci.com/edwardoughton/pysim5g.svg?branch=master)](https://travis-ci.com/edwardoughton/pysim5g)
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 Description
 ===========
-**pysim5g** is a software tool, based on the Monte-Carlo method, for simulation modelling of 5G.
+**pysim5g** is an open-source software tool, based on the Monte-Carlo method, for integrated engineering-economic modelling of 5G.
 
-Statistical modelling can be performed under different radio interference scenarios for assessing system-level performance of 4G and 5G co-existence in the sub-6GHz spectrum bands.
+Statistical analysis can be performed under different radio interference scenarios for assessing system-level performance of 4G and 5G co-existence in the sub-6GHz spectrum bands.
 
-The simulator focuses on quantifying the benefits of (i) ultra-dense networks, (ii) 5G spectral efficiency gains and (iii) the use of both 4G and 5G sub-6GHz spectrum bands.
+The simulator focuses on quantifying the benefits of (i) ultra-dense networks, (ii) 5G spectral efficiency gains and (iii) the use of both existing 4G and new 5G sub-6GHz spectrum bands.
 
 Setup and configuration
 =======================
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 Background and funding
 ======================
 
-The **python simulator for modelling 5G (pysim5g)** was funded by the
+The **python simulator for integrated modelling of 5G (pysim5g)** was funded by the
 UK [Digital Catapult's](http://www.digicatapult.org.uk) ESPRC-funded Researcher in Residence
 programme.