Update README.rst

Author: JamesPaynter

README.rst

@@ -6,7 +6,7 @@
 
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-A :math:`\gamma`-ray burst (GRB) light-curve analysis package.
+A gamma-ray burst (GRB) light-curve analysis package.
 
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@@ -16,7 +16,7 @@ A :math:`\gamma`-ray burst (GRB) light-curve analysis package.
 
 Introduction
 ------------
-*PyGRB* is a package to download :math:`\gamma`-ray burst (GRB) .FITS files from the relevant data archives (eg. NASA HEARSAC).
+*PyGRB* is a package to download gamma-ray burst (GRB) .FITS files from the relevant data archives (eg. NASA HEARSAC).
 At the moment only `BATSE <https://heasarc.gsfc.nasa.gov/FTP/compton/data/batse/>`__ data can be downloaded and analysed with the software, although with only slight tweaks GRBs from other satellites can be easily analysed.
 The code is then able to create light-curves from either pre-binned data or time-tagged photon-event data.
 Light-curves may then be fitted with with pulse models, for further analysis.