Addressing issue #372

Previous pull-requests #406 and #413 attempted to resolve #372. They
were, however, never merged in.

Given that #391 was just merged (which rewrites a significant amount of
prior code), I here took what we learned from #406 and #413 and
re-implemented it. This approach will be less error-prone than
attempting to rebase either of the former on the changes introduced in
 #391.

cheat/sheet.py

@@ -1,3 +1,4 @@
+import io
 import os
 import shutil
 
@@ -74,5 +75,5 @@ class Sheet:
         if not self.exists(sheet):
             Utils.die('No cheatsheet found for ' + sheet)
 
-        with open(self.path(sheet)) as cheatfile:
+        with io.open(self.path(sheet), encoding='utf-8') as cheatfile:
             return cheatfile.read()

cheat/sheets.py

@@ -1,3 +1,4 @@
+import io
 import os
 
 from cheat.utils import Utils
@@ -92,7 +93,7 @@ class Sheets:
 
         for cheatsheet in sorted(self.get().items()):
             match = ''
-            for line in open(cheatsheet[1]):
+            for line in io.open(cheatsheet[1], encoding='utf-8'):
                 if term in line:
                     match += '  ' + self._utils.highlight(term, line)