Treat UTF-16 strings in binary VDF as little-endian

Integers in binary VDF are already treated as little-endian (least
significant byte first) regardless of CPU architecture, but the 16-bit
units in UTF-16 didn't get the same treatment. This led to a test failure
on big-endian machines.

Resolves: ValvePython#33
Signed-off-by: Simon McVittie <[email protected]>

vdf/__init__.py

@@ -361,7 +361,7 @@ def read_string(fp, wide=False):
         result = buf[:end]
 
         if wide:
-            result = result.decode('utf-16')
+            result = result.decode('utf-16le')
         elif bytes is not str:
             result = result.decode('utf-8', 'replace')
         else:
@@ -469,7 +469,7 @@ def _binary_dump_gen(obj, level=0, alt_format=False):
                 value = value.encode('utf-8') + BIN_NONE
                 yield BIN_STRING
             except:
-                value = value.encode('utf-16') + BIN_NONE*2
+                value = value.encode('utf-16le') + BIN_NONE*2
                 yield BIN_WIDESTRING
             yield key + BIN_NONE + value
         elif isinstance(value, float):