upd README.md, refactor

demo/classifier_demo.py

@@ -1,7 +1,3 @@
-import sys
-
-sys.path.append("../")
-
 import neighbours as ns
 
 import numpy as np

demo/regressor_demo.py

@@ -1,6 +1,6 @@
-import matplotlib.pyplot as plt
 import neighbours as ns
 
+import matplotlib.pyplot as plt
 import numpy as np
 import random
 import math