updated README

README.md

@@ -96,6 +96,7 @@ The available models in this package:
 - `tan5()` - Oriani's theorem expanded ( Atan(z) + Btan^3(z) + Ctan^5(z)  )
 - `corbard()` - Error function refraction model
 - `matharExponential()` - Barometric exponential model by R. Mathar.
+
 The package also includes a python native port of the `SLA_REFRO()` FORTRAN routine, ported from pyslalib. See below for more information.