Delete matplotlib requirement

ETA.py

@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 
 import numpy as np
-import matplotlib.pyplot as plt
 import utils
 import sys
 import pathlib
@@ -65,7 +64,7 @@ while i < len( argv ):
                       \nParse a naroo ETA fits' )
                 exit()
             elif arg == '--version':
-                print( '0.3' )
+                print( '0.4' )
                 exit()
             elif arg == '--verbose':
                 verbose = True

spectrum.py

@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 
 import numpy as np
-import matplotlib.pyplot as plt
 from scipy.signal import medfilt , find_peaks
 from scipy.signal import convolve as sp_convolve
 from scipy.optimize import curve_fit