Move input files for Python programs to separate dir

Python/p081.py

@@ -35,7 +35,7 @@ def sum_paths(matrix, m, n):
 @timing
 def p081():
     try:
-        with open('matrix.txt', 'r', encoding='utf-8') as fp:
+        with open('input/matrix.txt', 'r', encoding='utf-8') as fp:
             matrix = fp.readlines()
     except FileNotFoundError:
         print('Error while opening file matrix.txt')

Python/p082.py

@@ -25,7 +25,7 @@ from projecteuler import dijkstra, timing
 @timing
 def p082():
     try:
-        with open('matrix.txt', 'r', encoding='utf-8') as fp:
+        with open('input/matrix.txt', 'r', encoding='utf-8') as fp:
             matrix = fp.readlines()
     except FileNotFoundError:
         print('Error while opening file matrix.txt')

Python/p083.py

@@ -24,7 +24,7 @@ from projecteuler import dijkstra, timing
 @timing
 def p083():
     try:
-        with open('matrix.txt', 'r', encoding='utf-8') as fp:
+        with open('input/matrix.txt', 'r', encoding='utf-8') as fp:
             matrix = fp.readlines()
     except FileNotFoundError:
         print('Error while opening file matrix.txt')