Flipped names of the two nir bands of S2-MSI.

pysegcnn/core/constants.py

@@ -83,8 +83,8 @@ class Sentinel2(MultiSpectralSensor):
     vnir1 = 5, (0.69, 0.71)
     vnir2 = 6, (0.73, 0.75)
     vnir3 = 7, (0.77, 0.79)
-    nir = 8, (0.78, 0.89)
-    nnir = '8A', (0.85, 0.88)
+    nnir = 8, (0.78, 0.89)
+    nir = '8A', (0.85, 0.88)
     vapor = 9, (0.94, 0.96)
     cirrus = 10, (1.36, 1.39)
     swir1 = 11, (1.57, 1.66)