update aliasing of plot_spectrum

Author: TomDonoghue

fooof/plts/__init__.py

@@ -1,4 +1,3 @@
 """Plots sub-module for FOOOF."""
 
-from .spectra import plot_spectra
-from .spectra import plot_spectra as plot_spectrum
+from .spectra import plot_spectrum, plot_spectra

fooof/plts/spectra.py

@@ -77,6 +77,10 @@ def plot_spectra(freqs, power_spectra, log_freqs=False, log_powers=False,
     style_spectrum_plot(ax, log_freqs, log_powers)
 
 
+# Alias `plot_spectrum` to `plot_spectra` for backwards compatibility
+plot_spectrum = plot_spectra
+
+
 @savefig
 @check_dependency(plt, 'matplotlib')
 def plot_spectra_shading(freqs, power_spectra, shades, shade_colors='r',