Remove unnecessary .encode when writing to cache

[wbernoudy]

Issue

The body of an object is read in as bytes in python 3 (at least sometimes?). When the cache option is on, NoDB will then attempt to call .encode() on these bytes and then write that to the cache file. However this method was removed in python 3, so error something like:

  File "/opt/conda/lib/python3.6/site-packages/nodb/__init__.py", line 145, in load
    in_file.write(serialized.encode(self.encoding))
AttributeError: 'bytes' object has no attribute 'encode'

is raised.

Solution

I think simply removing the .encode() should be fine, as python 2/3 can write bytes or str to a file just fine. Let me know if I have misunderstood what that line is supposed to be doing.

[coveralls]

Coverage remained the same at 56.738% when pulling 3b19a6b on wbernoudy:python3-cache-fix into 4616921 on Miserlou:master.

[bendog]

I feel like there might be a reason for this, it might be for python <= 3.5 compatibility.

[bendog]

replaced the code with non-breaking fix in #27