catchment crashes when dir points out of array boundaries

[AlienAtSystem]

The following code run over the attached image crashes via an IndexError. This appears to be the case because when it tries to calculate the catchment for the point on the edge, it tries to recurse into a cell outside of the image boundary.

from pysheds.grid import Grid
import numpy as np
import matplotlib.pyplot as plt
from affine import Affine

path="Tamriel_Heightmap_detail2.png"

img=plt.imread(path)
if len(img.shape)>2:
    img=img[:,:,0]

grid = Grid()
grid.add_gridded_data(img,'dem',affine=Affine.identity(), crs=grid.crs, nodata=0,mask=np.logical_not(np.isnan(img)))
grid.fill_depressions('dem', out_name='flooded_dem')
grid.resolve_flats('flooded_dem', out_name='inflated_dem')
#           [N, NE, E, SE, S, SW, W, NW]
dirmap = (64,  128,  1,   2,    4,   8,    16,  32)
grid.flowdir(data='inflated_dem', out_name='dir', dirmap=dirmap)
peak=(63,18)
grid.catchment(x=peak[1],y=peak[0],data='dir',xytype='index',out_name='c',dirmap=dirmap,recursionlimit=15000)
plt.imshow(grid.dir,alpha=0.5)
plt.show()

[mdbartos]

Greetings, this should be fixed in pysheds v0.3 (see #165), but needs to be tested for edge cases.