Small update

Author: ReikaNekoUwU

pyarchivefile.py

@@ -10113,8 +10113,9 @@ def _lvl(x):
         elif compression == "zstd" and "zstandard" in compressionsupport:
             bytesfp = MkTempFile()
             level = _lvl(compressionlevel)
-            compressor = zstd.ZstdCompressor(level)
+            compressor = zstd.ZstdCompressor(level=level)
             bytesfp.write(compressor.compress(fp.read()))
+            bytesfp.write(compressor.flush())
         elif compression == "lzma" and "lzma" in compressionsupport:
             bytesfp = MkTempFile()
             level = _lvl(compressionlevel)

pyarchivefile_py3.py

@@ -9361,8 +9361,9 @@ def _lvl(x):
         elif compression == "zstd" and "zstandard" in compressionsupport:
             bytesfp = MkTempFile()
             level = _lvl(compressionlevel)
-            compressor = zstd.ZstdCompressor(level)
+            compressor = zstd.ZstdCompressor(level=level)
             bytesfp.write(compressor.compress(fp.read()))
+            bytesfp.write(compressor.flush())
         elif compression == "lzma" and "lzma" in compressionsupport:
             bytesfp = MkTempFile()
             level = _lvl(compressionlevel)