v0.3.7

Fixed

• merge_cards and merge_notes didn't update metadata of return value, resulting in errors like
  Unknown value of _df_format. Issue #42
• force values weren't passed on, resulting in AnkiPandas refusing to do anything
  when writing out
• On Windows the int size is 32 bit even on 64 bit computers, resulting in issues with
  large values of ids. Issue #41