zstd: 0.7.1 -> 0.7.2

Fixes:
- ZSTD_decompressBlock() using multiple consecutive blocks.
- potential segfault on very large files (many gigabytes).
- CLI displays system error message when destination file
  cannot be created.
- potential leak in zdict.

pkgs/tools/compression/zstd/default.nix

@@ -3,10 +3,10 @@
 
 stdenv.mkDerivation rec {
   name = "zstd-${version}";
-  version = "0.7.1";
+  version = "0.7.2";
 
   src = fetchFromGitHub {
-    sha256 = "0h922kw6q0nsbigv86k7xqpfh4rj7rjxp60pgjmp5vlb2bma03sm";
+    sha256 = "1n88hb7a1x5xq4asq31yr92nkjylzdp21q0mxnrc6sd4kibcmbcs";
     rev = "v${version}";
     repo = "zstd";
     owner = "Cyan4973";