Revert "Merge pull request #1153 from cmcginty/remove-sbang"

This reverts commit 070e1c859f, reversing
changes made to 3faeda67bb.

plugins/python-build/bin/pyenv-install

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+#
 # Summary: Install a Python version using python-build
 #
 # Usage: pyenv install [-f] [-kvp] <version>

plugins/python-build/bin/pyenv-uninstall

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+#
 # Summary: Uninstall a specific Python version
 #
 # Usage: pyenv uninstall [-f|--force] <version>

plugins/python-build/test/stubs/stub

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 set -e
 
 status=0