Remove CPython 3.6.0a4 in favor of 3.6.0b1

plugins/python-build/share/python-build/3.6.0a4

@@ -1,8 +0,0 @@
-#require_gcc
-install_package "openssl-1.0.2g" "https://www.openssl.org/source/openssl-1.0.2g.tar.gz#b784b1b3907ce39abf4098702dade6365522a253ad1552e267a9a0e89594aa33" mac_openssl --if has_broken_mac_openssl
-install_package "readline-6.3" "https://ftpmirror.gnu.org/readline/readline-6.3.tar.gz#56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43" standard --if has_broken_mac_readline
-if has_tar_xz_support; then
-  install_package "Python-3.6.0a4" "https://www.python.org/ftp/python/3.6.0/Python-3.6.0a4.tar.xz#63acec349d20de412682f64c013f7c3374c695430b44e1c0ef12076da1d7fd2c" ldflags_dirs standard verify_py36 ensurepip
-else
-  install_package "Python-3.6.0a4" "https://www.python.org/ftp/python/3.6.0/Python-3.6.0a4.tgz#3cedd7c1462b41648c779b0c88d0acf4fa298179014ffe75791af9da166fed62" ldflags_dirs standard verify_py36 ensurepip
-fi