downloads: upgrade readline to 8.0

Author: indygreg

pythonbuild/downloads.py

@@ -253,10 +253,10 @@
         "version": "20.0.2",
     },
     "readline": {
-        "url": "ftp://ftp.gnu.org/gnu/readline/readline-6.3.tar.gz",
-        "size": 2468560,
-        "sha256": "56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43",
-        "version": "6.3",
+        "url": "ftp://ftp.gnu.org/gnu/readline/readline-8.0.tar.gz",
+        "size": 2975937,
+        "sha256": "e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461",
+        "version": "8.0",
         "library_names": ["readline"],
         "licenses": ["GPL-3.0"],
         "license_file": "LICENSE.readline.txt",