Corrected typo when using Peplinski mixing model.

gprMax/_version.py

@@ -1,4 +1,4 @@
 # This is where the version number is set and read by setup.py and conf.py (for the docs)
 
-__version__ = '3.0.2'
+__version__ = '3.0.3'
 

gprMax/materials.py

@@ -218,7 +218,7 @@ class PeplinskiSoil(object):
                 else:
                     self.startmaterialnum = len(G.materials)
             if not material:
-                m = Material(len(G.materials), requiredID, G)
+                m = Material(len(G.materials), requiredID)
                 m.average = False
                 m.er = eri
                 m.se = sig